SAC-31234: Exlcude un-auth streams from catalog while discovery

[satyendra101]

Description of change

• Handle discovery time check of streams by passing client (optional) to discovery
• Excluded streams which return 403 error code when running discovery due to permission error
• Added unit tests to validate the workflow.

Manual QA steps

• Discovery running
• Unittest running
• Integration tests running

Risks

Rollback steps

• revert this branch

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Pull request overview

Adds discovery-time permission checks so streams that the provided credentials cannot read (HTTP 403) are excluded from the generated Singer catalog, improving UX by preventing unusable streams from appearing in discovery results.

Changes:

• Extend discovery flow to accept an optional OutbrainClient and prune inaccessible streams (and dependent child streams) from the catalog.
• Introduce stream base classes and implement a permission probe for campaign.
• Update unit tests and bump version/changelog for the new behavior.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tap_outbrain/discover.py	Adds access-check and pruning logic during discovery when a client is provided.
tap_outbrain/streams.py	Introduces BaseStream and implements Campaign.check_access() used by discovery filtering.
tap_outbrain/client.py	Adds OutbrainForbiddenError, config support on the client, and raises on HTTP 403.
tap_outbrain/__init__.py	Wires discover-mode CLI path to construct a client and pass it into discovery.
tests/unittests/test_discover.py	Adds unit tests for access-check/pruning and updates discovery tests for new signature.
tests/unittests/test_init.py	Updates do_discover unit test for the new client parameter.
tests/unittests/test_catalog.py	Updates parent/root stream assertions to match new BaseStream.parent behavior.
setup.py	Bumps package version to 1.2.0.
CHANGELOG.md	Documents the new discovery filtering behavior (with a minor wording fix requested).

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