fix(dashboard): add multi account support for nrql query block in dashboard

[vagrawal-newrelic]

Please include a summary of the change and which issue is fixed (if relevant).

Enhanced the NRQL block in the dashboard to support multiple account IDs, enabling the creation of widgets with multi-account data. This update aligns with the dashboard team's efforts to improve multi-account functionality.

the changes are done as a part of this git Issue

Fixes # (issue)

Type of change
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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

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• My commit message follows conventional commits
• My code is formatted to Go standards
• I have performed a self-review of my own code
• I have made corresponding 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. Go here for instructions on running tests locally.