fix: Live plan not showing and output data size is undefined

[unidevel]

Description

1. Fix live plan not showing

2. Fix warnings in Query Header

3. Fix output data size is undefined - due to this change , outputDataSize is changed to outputDataSizeInBytes

Motivation and Context

PR for master branch: #26033

Impact

UI

Test Plan

Manual test

Contributor checklist

• Please make sure your submission complies with our contributing guide, in particular code style and commit standards.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
• If release notes are required, they follow the release notes guidelines.
• Adequate tests were added if applicable.
• CI passed.

Release Notes

== NO RELEASE NOTE ==

[unidevel]

Tested locally, seems fine.

[unidevel]

@tdcmeehan seems I have to cherry pick your free space fix in PR #26216