### Summary
`agent/tools/google.py` indexes `search["organic_results"]` directly
after `GoogleSearch(params).get_dict()`. serpapi returns `{"error":
...}` **without** an `organic_results` key on realistic conditions — an
invalid API key, an exhausted plan/quota, or a query that matched
nothing. that raised `KeyError('organic_results')`, which the tool's
retry loop then surfaced to the model as the opaque `"Google error:
'organic_results'"` instead of the real reason.
this guards the missing key and raises serpapi's actual `error` message
(with a clear fallback) into the existing retry/`_ERROR` path, so the
model sees e.g. `"Google error: Invalid API key."`. valid responses are
unchanged.
adds `test/unit_test/agent/tools/test_google_unit.py` covering the
error-response path (asserts the real message is surfaced, no
`KeyError`) and the normal result path, mirroring the existing
`test_googlescholar.py` pattern (skips when the `serpapi` SDK is
absent).
---------
Co-authored-by: Yaroslav98214 <diakovichyaroslav30@gmail.com>
### What problem does this PR solve?
Add mechanism to check cancellation in Agent.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Fix invalid COMPONENT_EXEC_TIMEOUT. #10273
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
#9082#6365
<u> **WARNING: it's not compatible with the older version of `Agent`
module, which means that `Agent` from older versions can not work
anymore.**</u>
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
