test: extract DF idempotency e2e tests

[dreamorosi]

Summary

Changes

Please provide a summary of what's being changed

As described in the linked issue, this PR extracts the Durable functions e2e tests from the other e2e tests of the Idempotency utility to make it easier to conditionally run them based on runtime version.

I have verified that the tests are running correctly with 3 successful consecutive runs:

• https://github.com/aws-powertools/powertools-lambda-typescript/actions/runs/21719901261
• https://github.com/aws-powertools/powertools-lambda-typescript/actions/runs/21720506008
• https://github.com/aws-powertools/powertools-lambda-typescript/actions/runs/21720910732 (this run had a transient failure in another module, which doesn't negate the statement above since the idempotency tests are green at the 1st try)

Please add the issue number below, if no issue is present the PR might get blocked and not be reviewed

Issue number: closes #4993

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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