@W-22586635 Add list-flow-runs and list-flow-tasks tools

[showmethecold]

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Description

Adds two read-only Tableau Prep tools:

list-flow-runs — site-wide run history, newest-first with a default limit of 100. Reports completeness via mcp.resultInfo and provides a best-effort mcp.failureInsight link for failed runs.
list-flow-tasks — scheduled runFlow tasks with filtering, sorting, and limits.
Both document caller-permission caveats for non-admin users.

Also adds supporting REST APIs/types, shared filtering utilities, OAuth scopes, tests, and documentation.

Motivation and Context

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

How Has This Been Tested?

Unit tests and Manual end-to-end validation

Related Issues

Closes #532

Checklist

• I have updated the version in the package.json file by using npm run version. For example,
  use npm run version:patch for a patch version bump.
• I have made any necessary changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have documented any breaking changes in the PR description. For example, renaming a config
  environment variable or changing its default value.

Contributor Agreement

By submitting this pull request, I confirm that:

• I have read the CONTRIBUTING guidelines for this project and followed
  its Contribution Checklist.

[ccrick-tableau]

Super excited for these! Thank you!