feat(dashboards): add support for thresholds_with_series_overrides

[Aashirwadjain]

Description

This PR aims to add support for thresholds_with_series_overrides in newrelic_one_dashboard.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• 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.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 20.10050% with 318 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.25%. Comparing base (839155d) to head (c05c4f9).

Files with missing lines	Patch %	Lines
newrelic/structures_newrelic_one_dashboard.go	0.00%	317 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2947      +/-   ##
==========================================
- Coverage   30.38%   30.25%   -0.14%     
==========================================
  Files         107      107              
  Lines       29651    30045     +394     
==========================================
+ Hits         9009     9089      +80     
- Misses      20460    20773     +313     
- Partials      182      183       +1     

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