fix(integ): adjust timeout on memory test.

[Hweinstock]

Problem

Tests are timing out on delete https://github.com/aws/bedrock-agentcore-sdk-python/actions/runs/35110378662/job/104856020087.

Also noticed a race condition where update does not wait for the memory to be active before continuing.

Solution

• extend timeout to 300s.
• add wait_for_active.

Verification

ran tests in dev account.

[agentcore-devx-automation]

Claude Security Review: no high-confidence findings. (run)

[Hweinstock]

Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step.

integ test failures unrelated, doesn't allow run from fork, but ran memory in dev account.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@cc980d1). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #667   +/-   ##
=======================================
  Coverage        ?   89.52%           
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  Files           ?      123           
  Lines           ?    10705           
  Branches        ?     1678           
=======================================
  Hits            ?     9584           
  Misses          ?      733           
  Partials        ?      388           

Flag	Coverage Δ
unittests	89.52% <ø> (?)

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