Linter CLI: Lower --log-level for --only and --all-rules runs

[marcoroth]

This pull request updates the linter CLI so that --only and --all-rules lower the effective logLevel for that run, down to the lowest severity that actually came up, so the rules you asked to run always get reported.

Both flags already ignore the rule configuration in .herb.yml to put a specific set of rules in front of you, but the configured logLevel still applied on top of that. Asking for a single rule whose offenses sit below that level produced a run that printed no offenses at all and only accounted for them in the summary:

❯ herb-lint --only html-no-duplicate-ids
✓ Using Herb config file at .herb.yml

 Rule offenses:
  html-no-duplicate-ids (1 offense in 1 file)

 Summary:
  Checked      1 file
  Failing      0 offenses
  Not failing  1 hint (1 offense across 1 file, below --fail-level=error)
  Not shown    1 offense hidden, show it with --log-level=hint
  Fixable      0 offenses
  Rules        1 enabled | filtered by --only

Naming a rule is a stronger signal than the logLevel that keeps everyday runs quiet, so the level now drops to the lowest severity present in the run, and the summary says where that came from:

❯ herb-lint --only html-no-duplicate-ids
✓ Using Herb config file at .herb.yml

app/views/events/_event.html.erb:
  2:5  ⚠ Duplicate ID `event-title` found. IDs must be unique within a document. (html-no-duplicate-ids)

 Rule offenses:
  html-no-duplicate-ids (1 offense in 1 file)

 Summary:
  Checked      1 file
  Failing      0 offenses
  Not failing  1 hint (1 offense across 1 file, below --fail-level=error)
  Log level    hint | lowered from warning by --only
  Fixable      0 offenses
  Rules        1 enabled | filtered by --only

--all-rules gets the same treatment, since the rules it widens the run to are mostly the ones that aren't enabled by default:

  Log level    hint | lowered from warning by --all-rules

Resolves #1980

[github-actions]

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_{🌱 Grown from commit b6fd14e}

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✅ Preview deployment has been cleaned up.

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@2006

npx https://pkg.pr.new/@herb-tools/language-server@2006

npx https://pkg.pr.new/@herb-tools/linter@2006

commit: b6fd14e