Update Google Pubsub updater configuration

[vpaturet]

Summary

This PR:

• removes unused parameters in the Google PubSub SIRI updater,
• documents the parameters,
• adds a dedicated markdown page for this updater.

Removed parameters:

• the parameter projectName is deprecated and removed. It is replaced by the now-mandatory parameters topicProjectName and subscriptionProjectName
• the parameter purgeExpiredData is managed in the section timetableUpdates . It does not need to be specified in this updater.
• the parameter type is managed by the configuration framework. It does not need to be specified in this updater.

Issue

No

Unit tests

Updated documentation test

Documentation

Updated documentation

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 94.87179% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.45%. Comparing base (827684a) to head (fc497ca). Report is 1 commits behind head on dev-2.x.

Files	Patch %	Lines
...er/google/SiriETGooglePubsubUpdaterParameters.java	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev-2.x #5927 +/- ## ============================================= + Coverage 69.43% 69.45% +0.01% Complexity 17065 17065 ============================================= Files 1934 1934 Lines 73606 73624 +18 Branches 7540 7539 -1 ============================================= + Hits 51109 51135 +26 + Misses 19870 19865 -5 + Partials 2627 2624 -3 ```

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[vpaturet]

@leonardehrenfried is the docs build failing due to a recent dependency upgrade?

[leonardehrenfried]

Something like that: https://github.com/magidoc-org/magidoc/issues/319#issuecomment-2185961583

[leonardehrenfried]

If you rebase the CI failure should be fixed.