fix(tools): add timeouts to HTTP requests in API client helpers

[agharsallah]

Link to Issue or Description of Change

2. Or, if no issue exists, describe the change:

Problem:

Every requests.get/requests.post call in the API Hub and Application
Integration tool clients omitted the timeout= argument. python-requests
defaults to no timeout, so a stalled or unresponsive endpoint hangs the tool
invocation — and therefore the agent — indefinitely. This was also an internal
inconsistency: load_web_page.py already sets a default request timeout
(_DEFAULT_TIMEOUT_SECONDS = 30).

Affected call sites:

• src/google/adk/tools/apihub_tool/clients/apihub_client.py (4 requests.get)
• src/google/adk/tools/application_integration_tool/clients/connections_client.py (1 requests.get)
• src/google/adk/tools/application_integration_tool/clients/integration_client.py (1 requests.post)

Solution:

Add a module-level _REQUEST_TIMEOUT_SECONDS = 30 constant to each client
module (matching the value used in load_web_page.py) and pass timeout= to
every request call site. Keeping a named constant per module makes the value
discoverable and easy to tune, consistent with the existing pattern.

Testing Plan

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

Extended the existing client tests to assert the mocked requests.* call
receives a timeout argument (timeout=ANY).

$ pytest tests/unittests/tools/apihub_tool/clients/test_apihub_client.py \
         tests/unittests/tools/application_integration_tool/clients/test_connections_client.py \
         tests/unittests/tools/application_integration_tool/clients/test_integration_client.py
94 passed, 5 warnings

Manual End-to-End (E2E) Tests:

Not applicable — this is a minimal, behavior-preserving change (adds a request
timeout only). Existing unit tests cover the request call sites.

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

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