Improve DDS stress testing: introduce enum stress mode

[clarenceli-msft]

AB#2729, AB#2730

This PR is a prototype for improving the Test - DDS Stress line by using a numeric stressLevel instead of a boolean isStress. This change allows for more granular control over whether to use stress runs and to what degree.

The follow-up tasks include:

1. Integrating this functionality (potentially as a stage) into the CI build pipeline with a light stress level mode, so it can be triggered in the PR gateway.

2. Creating a long-running pipeline to execute the DDS stress tests with a heavy stress level mode, scheduled to run periodically during off-peak hours, similar to the test stability pipeline.

Guidelines for Pull Requests.

Reviewer Guidance

The review process is outlined on this wiki page.

List any specific things you want to get reviewer opinions on, and anything a reviewer would need to know to review this PR effectively. Things you might want to include:

• Questions about how to properly make automated tests for your changes.
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• etc.

If you have any questions in this section, consider making the PR a draft until all questions have been resolved.

[msfluid-bot]

⯅ @fluid-example/bundle-size-tests: +245 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	460.31 KB	460.34 KB	⯅ +35 Bytes
azureClient.js	557.29 KB	557.34 KB	⯅ +49 Bytes
connectionState.js	724 Bytes	724 Bytes	■ No change
containerRuntime.js	259.58 KB	259.6 KB	⯅ +14 Bytes
fluidFramework.js	405.95 KB	405.96 KB	⯅ +14 Bytes
loader.js	134.34 KB	134.36 KB	⯅ +14 Bytes
map.js	42.46 KB	42.46 KB	⯅ +7 Bytes
matrix.js	148.63 KB	148.64 KB	⯅ +7 Bytes
odspClient.js	524.25 KB	524.3 KB	⯅ +49 Bytes
odspDriver.js	97.84 KB	97.86 KB	⯅ +21 Bytes
odspPrefetchSnapshot.js	42.81 KB	42.82 KB	⯅ +14 Bytes
sharedString.js	164.82 KB	164.83 KB	⯅ +7 Bytes
sharedTree.js	396.41 KB	396.41 KB	⯅ +7 Bytes
Total Size	3.31 MB	3.31 MB	⯅ +245 Bytes

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Baseline commit: f57799c060d45f2356eef26b3a221f72c071c426

Generated by :no_entry_sign: dangerJS against d3a3368b6824385f861a5a49615f55c3b7397dbb

[changeset-bot[bot]]

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Latest commit: d7ca1da523b081e0dc8cf6fb17c044ef3d77c51c

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