Fix the release builds for swh-search

The build is failing due to a missing module during the yarn build

pypi build:

17:33:59  + yarn build
17:33:59  yarn run v1.22.5
17:33:59  $ yarn build-so && yarn build-wasm
17:33:59  $ yarn generate && cd query_language && python3 build.py
17:33:59  $ cd query_language && tree-sitter generate --no-bindings && echo 'Generated parser files '
17:34:00  Generated parser files 
17:34:00  Traceback (most recent call last):
17:34:00    File "build.py", line 1, in <module>
17:34:00      from tree_sitter import Language
17:34:00  ModuleNotFoundError: No module named 'tree_sitter'
17:34:00  error Command failed with exit code 1.

Debian build, 2 issues:

16:42:50  running ts_build_export
16:42:50  running ts_install
16:42:50  sh: 1: yarn: not found
16:42:50  running ts_build
16:42:50  running ts_build_so
16:42:50  sh: 1: yarn: not found
16:42:50  running ts_build_wasm
16:42:50  sh: 1: yarn: not found
16:42:50  static files generated. copying them to package dir
16:42:50  cp: cannot stat 'query_language/swh_ql.so': No such file or directory
16:42:50  cp: cannot stat 'query_language/swh_ql.wasm': No such file or directory

16:42:51  ============================= test session starts ==============================
16:42:51  platform linux -- Python 3.9.2, pytest-6.0.2, py-1.10.0, pluggy-0.13.0
16:42:51  rootdir: /<<PKGBUILDDIR>>, configfile: pytest.ini
16:42:51  plugins: swh.journal-0.8.0, swh.core-0.14.4, mock-1.10.4, hypothesis-5.43.3
16:42:51  collected 131 items / 2 errors / 129 selected
16:42:51  Hint: make sure your test modules/packages have valid Python names.
16:42:51  Traceback:
16:42:51  /usr/lib/python3.9/importlib/__init__.py:127: in import_module
16:42:51      return _bootstrap._gcd_import(name[level:], package, level)
16:42:51  swh/search/tests/test_translator.py:3: in <module>
16:42:51      from swh.search.translator import Translator
16:42:51  swh/search/translator.py:4: in <module>
16:42:51      from tree_sitter import Language, Parser
16:42:51  E   ModuleNotFoundError: No module named 'tree_sitter'
16:42:51  =============================== warnings summary ===============================

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Migrated from T3484 (view on Phabricator)