[Asset Inventory][EC2] Add timeout handler to IAM resolver

[kubasobon]

Summary of your changes

Add 10s timeout to GetInstanceProfile calls in EC2 instance fetcher

The IAM client uses the default HTTP transport with no timeout. If GetInstanceProfile hangs, the fetch loop blocks before sending any asset to the channel, so zero EC2 assets are published. Errors are already handled gracefully (falls back to the profile ARN), so a timeout is enough to resolve any issues.

Related Issues

Resolves error for integration tests.

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[github-actions]

@Mergifyio backport 9.5 9.4 8.19

[mergify]

backport 9.5 9.4 8.19

✅ Backports have been created

Details

• #7920 [9.5](backport #7919) [Asset Inventory][EC2] Add timeout handler to IAM resolver has been created for branch 9.5
• #7921 [9.4](backport #7919) [Asset Inventory][EC2] Add timeout handler to IAM resolver has been created for branch 9.4 but encountered conflicts

Cherry-pick of e1ea204 has failed:

On branch mergify/bp/9.4/pr-7919
Your branch is up to date with 'origin/9.4'.

You are currently cherry-picking commit e1ea204a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   internal/inventory/awsfetcher/fetcher_ec2_instance.go

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

• #7922 [8.19](backport #7919) [Asset Inventory][EC2] Add timeout handler to IAM resolver has been created for branch 8.19 but encountered conflicts

Cherry-pick of e1ea204 has failed:

On branch mergify/bp/8.19/pr-7919
Your branch is up to date with 'origin/8.19'.

You are currently cherry-picking commit e1ea204a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   internal/inventory/awsfetcher/fetcher_ec2_instance.go

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally