Add datanode.log to the support bundle

[todvora]

Added datanode.log to the support bundle. Removed opensearch stdout and stderr, these are already included in the datanode.log, which is easier to follow anyway.

Description

• Added memory appender in datanode,
• Added rest endpoint for the datanode.log
• Added datanode.log handling in the support bundle
• Removed opensearch.log and opensearch.err handlers in the support bundle

Motivation and Context

Fixes #20919

How Has This Been Tested?

Manually

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[moesterheld]

LGTM. Thank you for the change!

Only two minor nitpicks, but they do not necessarily need to be changed.

[todvora]

Thanks for the review @moesterheld, fixed both of these.