Enhancement: Amend URL metrics to the generator meta tag content

[nani-samireddy]

Summary

Fixes #1953

Relevant technical choices

• Updated the function od_optimize_template_output_buffer to include the URL metric groups data in the generator's META tag.

• This adds additional information about each breakpoint's minimum viewport width and the corresponding URL metrics status for that viewport group.

• The generator's META tag is updated from:

  <meta name="generator" content="optimization-detective 1.0.0;" />

  to:

  <meta name="generator" content="optimization-detective 1.0.0; url_metric_groups={0:complete, 480:empty, 600:populated, 782:complete}" />

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.33%. Comparing base (f751ae2) to head (6330958).
Report is 26 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk    #1954      +/-   ##
==========================================
+ Coverage   72.26%   72.33%   +0.07%     
==========================================
  Files          85       85              
  Lines        6958     6976      +18     
==========================================
+ Hits         5028     5046      +18     
  Misses       1930     1930              

Flag	Coverage Δ
multisite	72.33% <100.00%> (+0.07%)	⬆️
single	40.61% <0.00%> (-0.11%)	⬇️

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[github-actions]

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Co-authored-by: nani-samireddy <[email protected]>
Co-authored-by: westonruter <[email protected]>

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[westonruter]

Note the data-od-replaced-content attribute is not ideal. This will have to be addressed in a separate issue, however: #1931 (comment)

[felixarntz]

Thanks @nani-samireddy, LGTM!