Source Zendesk Support: Remove custom availability strategy

[artem1205]

What

Closes #22275

How

Remove custom availability strategy

Recommended reading order

1. streams.py
2. y.python

🚨 User Impact 🚨

no breaking changes

Pre-merge Actions

Updating a connector

Community member or Airbyter

• Grant edit access to maintainers (instructions)
• Unit & integration tests added

Airbyter

If this is a community PR, the Airbyte engineer reviewing this PR is responsible for the below items.

• Create a non-forked branch based on this PR and test the below items on it
• Build is successful
• If new credentials are required for use in CI, add them to GSM. Instructions.

[github-actions]

Before Merging a Connector Pull Request

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• PR name follows PR naming conventions
• Breaking changes are considered. If a Breaking Change is being introduced, ensure an Airbyte engineer has created a Breaking Change Plan.
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[github-actions]

source-zendesk-support test report (commit cb82a6bbd7) - ✅

⏲️ Total pipeline duration: 11mn06s

Step	Result
Connector package install	✅
Build source-zendesk-support docker image for platform linux/x86_64	✅
Unit tests	✅
Acceptance tests	✅
Code format checks	✅
Validate airbyte-integrations/connectors/source-zendesk-support/metadata.yaml	✅
Connector version semver check	✅
Connector version increment check	✅
QA checks	✅

🔗 View the logs here

☁️ View runs for commit in Dagger Cloud

Please note that tests are only run on PR ready for review. Please set your PR to draft mode to not flood the CI engine and upstream service on following commits.
You can run the same pipeline locally on this branch with the airbyte-ci tool with the following command

airbyte-ci connectors --name=source-zendesk-support test