PMM-7246 Tweak flags

[AlekSi]

PMM-7246

• Build: PMM-7246 Tweak flags Percona-Lab/pmm-submodules#1358

• Links to other linked pull requests (optional).

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• Tests passed.
• Feature build pass.
• (Re)requested review.
• Fix conflicts with target branch.
• Update API dependency.
• Update jira ticket description if needed.
• Attach screenshots/console output to confirm new behavior to jira ticket, if applicable.

[percona-robot]

🚫 [golangci-lint] _{reported by reviewdog 🐶}
models/victoriametrics.go:50: Line contains TODO/BUG/FIXME: "TODO read settings, set -external.url an..." (godox)

[codecov]

Codecov Report

Merging #605 (439a6a6) into PMM-2.0 (0db06f7) will increase coverage by 0.07%.
The diff coverage is 55.55%.

@@             Coverage Diff             @@
##           PMM-2.0     #605      +/-   ##
===========================================
+ Coverage    49.57%   49.65%   +0.07%     
===========================================
  Files          123      123              
  Lines        15577    15562      -15     
===========================================
+ Hits          7722     7727       +5     
+ Misses        7143     7127      -16     
+ Partials       712      708       -4     

Flag	Coverage Δ
all	49.06% <55.55%> (+0.07%)	⬆️
cover	49.65% <55.55%> (+0.09%)	⬆️
crosscover	49.65% <55.55%> (+0.07%)	⬆️
update	16.88% <60.00%> (+0.15%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
models/settings.go	100.00% <ø> (ø)
models/settings_helpers.go	78.60% <ø> (+3.15%)	⬆️
services/supervisord/supervisord.go	66.66% <ø> (-0.10%)	⬇️
utils/envvars/parser.go	82.53% <0.00%> (+4.92%)	⬆️
models/victoriametrics.go	67.56% <100.00%> (+2.86%)	⬆️
services/supervisord/maintail.go	100.00% <0.00%> (+15.78%)	⬆️

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