[eas-cli] Improved service account display in submission summary

[barthap]

Checklist

Didn't add changelog entry since the original change in #664 hasn't been published yet

Why

I think that it would be more consistent with how we display Build in submission summary - a "nested group" is made for related fields:

Before

After

How

Copied summary formatting from Build section

Test Plan

Ran it and took screenshots visible above

[codecov]

Codecov Report

Merging #674 (14925ec) into main (12ded8c) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #674      +/-   ##
==========================================
+ Coverage   49.63%   49.66%   +0.03%     
==========================================
  Files         313      313              
  Lines       10778    10784       +6     
  Branches     2006     2006              
==========================================
+ Hits         5349     5355       +6     
  Misses       5423     5423              
  Partials        6        6              

Impacted Files	Coverage Δ
...ges/eas-cli/src/submit/android/AndroidSubmitter.ts	100.00% <100.00%> (ø)

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[github-actions]

Size Change: +255 B (0%)

Total Size: 22.5 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	22.5 MB	+255 B (0%)

_{compressed-size-action}

[dsokal]

Use template string.

[barthap]

Tried that, but IMO the code becomes less readable:

  return `\n${formatFields(filteredFields, {
    labelFormat: label => `    ${chalk.dim(label)}:`,
  })}`;