feat(dashboards): add thresholds_with_series_overrides support

[Aashirwadjain]

Description

This PR aims to add thersholds_with_series_overrides support.

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.

How to test this change?

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 17.46032% with 468 lines in your changes missing coverage. Please review.
✅ Project coverage is 34.27%. Comparing base (98a1f7d) to head (cc0bd69).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
newrelic/structures_newrelic_one_dashboard.go	4.48%	465 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2985      +/-   ##
==========================================
- Coverage   34.66%   34.27%   -0.40%     
==========================================
  Files         107      107              
  Lines       23759    24278     +519     
==========================================
+ Hits         8237     8322      +85     
- Misses      15335    15766     +431     
- Partials      187      190       +3     

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