perf: preload _locales/en/messages.json so we don't have to wait as long for our JS to dynamically load it

[davidmurdoch]

We always load the English version of messages.json. This PR makes use of link rel=preload so that the browser will get the file ready for use immediately -- well before our JavaScript file that will eventually need it asks for it. This reduces the amount of waiting due to Network Waterfall (even if the network is the local file system).

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[metamaskbot]

Builds ready [369b1f5]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5
  • common: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (84 ± 15 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	68	275	115	44	21
		domContentLoaded	39	177	81	33	16
		load	49	177	84	31	15
		domInteractive	9	78	27	16	8

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 0 Bytes (0.00%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.01%. Comparing base (d3541a3) to head (369b1f5).
Report is 25 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #26556      +/-   ##
===========================================
+ Coverage    69.96%   70.01%   +0.04%     
===========================================
  Files         1405     1405              
  Lines        48996    49029      +33     
  Branches     13697    13706       +9     
===========================================
+ Hits         34280    34325      +45     
+ Misses       14716    14704      -12     

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[metamaskbot]

Missing release label release-12.5.0 on PR. Adding release label release-12.5.0 on PR and removing other release labels(release-12.6.0), as PR was added to branch 12.5.0 when release was cut.