Added implementation to exclude unauthorized streams from discovery

[akkumar-qlik]

Description of change

https://qlik-dev.atlassian.net/browse/SAC-30911
Excluded unauthorized streams from catalog during discovery
Child streams are automatically excluded when their parent stream is inaccessible.
Added unit test case and updated integration test accordingly

Manual QA steps

• Discovery: Running
• Sync: Running
• Unit Tests: Running
• Integration test: Running

Risks

Rollback steps

• revert this branch

AI generated code

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• this PR has been written with the help of GitHub Copilot or another generative AI tool

[Copilot]

Pull request overview

This PR updates tap discovery to probe stream accessibility and exclude streams (and their children) that return HTTP 403, so unauthorized streams don’t appear in the discovered catalog.

Changes:

• Add per-stream access probing during discovery and prune child streams when their parent is inaccessible.
• Introduce BaseStream.check_access() to encapsulate the 403-access check behavior.
• Update unit/integration tests and bump version + changelog entry.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/unittests/test_discovery.py	Adds unit coverage for access checks, child pruning, and discover(client) behavior.
tests/base.py	Adds helper to compute expected stream names while allowing forbidden streams to be excluded in integration expectations.
tap_gitlab/streams/abstracts.py	Adds BaseStream.check_access() and adjusts default schema/metadata initialization for streams without a catalog.
tap_gitlab/discover.py	Applies access checks during discovery and prunes inaccessible child streams.
tap_gitlab/init.py	Passes the constructed Client into discovery.
setup.py	Bumps package version to 1.2.0.
CHANGELOG.md	Documents the new discovery behavior in 1.2.0.

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