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Implement `swh alter remove --dry-run`

Jérémy Bobbio (Lunar) requested to merge lunar/swh-alter:migrate-sql-removal-from-snippets into main

This migrates most of the removal code from snippets to swh.alter. We still need to migrate the actual deletion code.

These changes add the following command:

$ swh alter remove --dry-run https://example.com/swh/graph2
Removing the following origins:
 - swh:1:ori:8f50d3f60eae370ddbf85c86219c55108a350165
We would remove 11 objects:
- swh:1:ori:8f50d3f60eae370ddbf85c86219c55108a350165
- swh:1:snp:0000000000000000000000000000000000000022
- swh:1:rel:0000000000000000000000000000000000000021
- swh:1:rev:0000000000000000000000000000000000000018
- swh:1:rev:0000000000000000000000000000000000000013
- swh:1:dir:0000000000000000000000000000000000000017
- swh:1:dir:0000000000000000000000000000000000000012
- swh:1:dir:0000000000000000000000000000000000000016
- swh:1:cnt:0000000000000000000000000000000000000014
- swh:1:cnt:0000000000000000000000000000000000000011
- swh:1:cnt:0000000000000000000000000000000000000015

The flags --output-inventory-subgraph, --output-removable-subgraph, and --output-pruned-removable-subgraph can be used to produce various Graphviz .dot source files, that can produce a visual representation with the dot command.

The next step after this is to create records of the soon-to-be-removed objects so we can rollbacks in case of errors or race conditions.

Close #1 (closed)

Edited by Jérémy Bobbio (Lunar)

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