micro-fix: GitGuardian alert: derive credential IDs from fixtures instead of hardcoding

[Taimoor2500]

Summary
When forking the repository, GitGuardian reported hardcoded credential-like strings in the Aden sync tests. This PR removes those hardcoded values and derives them from fixtures instead.
Problem
In test_sync_all, the credential ID "aHVic3BvdDp0ZXN0OjEzNjExOjExNTI1" was hardcoded in both the mock data and the assertion. GitGuardian flagged this as a potential secret.
Solution
Use aden_response.integration_id as the single source of truth for the credential ID. The mock and assertion now reference this value instead of repeating the string. Behavior is unchanged; only the way the ID is obtained is different.
Changes
test_sync_all: Replace hardcoded credential ID with aden_response.integration_id in both the mock and the assertion.

[github-actions]

PR Closed - Requirements Not Met

This PR has been automatically closed because it doesn't meet the requirements.

Missing: No linked issue found.

To fix:

1. Create or find an existing issue for this work
2. Assign yourself to the issue
3. Re-open this PR and add Fixes #123 in the description

Exception: To bypass this requirement, you can:

• Add the micro-fix label or include micro-fix in your PR title for trivial fixes
• Add the documentation label or include doc/docs in your PR title for documentation changes

Micro-fix requirements (must meet ALL):

Qualifies	Disqualifies
< 20 lines changed	Any functional bug fix
Typos & Documentation & Linting	Refactoring for "clean code"
No logic/API/DB changes	New features (even tiny ones)

Why is this required? See #472 for details.

[kostasuser01gr]

Hi @Taimoor2500! I noticed your PR was closed because it was missing a link to the issue. Since your fix is under 20 lines and addresses a bug, it qualifies as a micro-fix.

To get it merged, you just need to:

1. Update your PR body to include Fixes #5682.
2. Reopen the PR.

You can do this via the CLI:

gh pr edit 5681 --body "$(gh pr view 5681 --json body -q .body)

Fixes #5682"
gh pr reopen 5681

Hope this helps! — Konstantinos

[Taimoor2500]

@kostasuser01gr i created a micro-fix pr for this earler link: PR