Move all templates, views, urls and commands related to the mailmap
feature into its dedicated django application.

Please note that the initial migration will not perform any database
operations as the tables have already been created by the swh.web.auth
django application the mailmap feature was previously located at.

Related to T4398

Towards reorganizing swh-web features into multiple django applications,
introduce the following changes regarding their settings:

- Declare a fixed set of base django apps and enable to add extra ones
  through configuration

- Add application templates directory to django templates search paths

- Automatically register URLs of selected django applications

- Inject swh-web django app names in templates to check a feature is enabled

Related to T4398

Inject transitions dict into Django template instead and pass it to js.

This will prevent submission of add forge now requests with invalid
forge URLs from the Web UI and the Web API.

Previously, the last moderator and modification date for an Add Forge Now
request were retrieved by the model serializer.

While it is enough for display, it prevents to sort the requests by last
modification date when using datatables.

So prefer to add the last_moderator and last_modified_date to the Request
model instead and update their values when a new RequestHistory model
is created.

When running migrations, existing requests stored in production database
will have the values of these new fields set according to their history.

It enables to help debugging swh-web JavaScript errors in Sentry Web UI
by demangling transpiled, minified and bundled JavaScript in order to
view source code context obtained from stack traces in its original,
untransformed form.

It looks weird when email clients soft-wrap on smaller number
of columns; eg. Thunderbird defaults to 72 when editing in
plain text.

The ctags indexer has been stopped a long time ago and recently got dropped from the
indexer base code. As the api exposing this in the webapp is hidden, we can safely
remove them.

This also fixes build [1].

Related to T4273

[1] https://jenkins.softwareheritage.org/view/swh%20master%20(draft)/job/DWAPPS/job/tests/3265/console

Menu items for those features should be highlighted when browsing
associated pages for consistency in the Web UI.

When sidebar is in collpased mode, it was previously flashing from expanded
to collapsed when loading a page as its state was changed using javascript.

So prefer to use a cookie describing sidebar state that can be read server
side from django and injected in templates, this way the sidebar is ensured
to be in correct state in HTML code on page load.

eg. https://sentry.softwareheritage.org/share/issue/12730ae3258d4868a087863e7fe1c94a/
is '406 Not Acceptable'

The error output was filtered out due to the high amount of urllib3 debug
logs but those logs are now longer enabled.

So remove error output filtering to help debugging failed migrations.

It generates a lof of noise and clutters terminal a lot.

The target and root directory differ in this test, causing this assertion to fail
when the test actually runs

For staff users only, like other extrinsic metadata

which redirects to the 'proper' one based on extended SWHIDs.

It is more convenient for debugging than computing URL hashes;
and it will also be used in a template (which cannot really compute
SWHID, and would need non-trivial refactoring to get access to it)

It is purposefully discouraged to query the api-1-raw-extrinsic-metadata-swhid
endpoint directly, as extended SWHIDs should not be part of the public API.

Instead, clients should query api-1-origin first, and rely on the link
in its response to fetch metadata.

Prefer to use a div instead of an iframe to avoid blinking banner
on page load.

Nevertheless, keep the iframe view to ease embedding in external
WordPress website.

Replace use of django.conf.urls.url by django.urls.re_path.

Fix inbound_email appplication name.

Add a small hack to ensure django-js-reverse compatibility
with django 4.x (issue fixed upstream but not released).

Black reforms `word2vec.ipynb` otherwise (or complains the ipynb is not
installed)

It now allows setting custom strategies as 'target'

without either RFC5987/6266-encoding of the filename or RFC2231-encoding
of the header, gunicorn crashes when trying to decode the header as ASCII.

The banner will be displayed on archive.softwareheritage.org and
softwareheritage.org.

This imports the content of this PR to upstream:
https://github.com/untitaker/pytest-subtesthack/pull/7

Using older versions works for passing tests, but assertion failures
cause a very obscure traceback on teardown

For some reason it is not an issue within tox; but mypy has been
bugging me about this for a while.

Web API should be as dumb as possible and should not attempt to
lookup an origin with and without trailing slash in its URL.

rDWAPPS56fb869644ad45e0648f4ad45c07619d468019b4 introduced that
regression but that process should only be performed in a Web
UI context.

Related to D7980