PMM-8877: turn ON IA by default, remove ability to disable it

[oter]

PMM-8681

API PR: percona/pmm#786

• Build: PMM-8877: FB turn ON IA by default, remove ability to disable it Percona-Lab/pmm-submodules#2043

• 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.

[codecov]

Codecov Report

Merging #834 (95dee89) into main (35d1183) will increase coverage by 0.02%.
The diff coverage is 33.33%.

❗ Current head 95dee89 differs from pull request most recent head 9b3c1eb. Consider uploading reports for the commit 9b3c1eb to get more accurate results

@@            Coverage Diff             @@
##             main     #834      +/-   ##
==========================================
+ Coverage   50.30%   50.32%   +0.02%     
==========================================
  Files         174      174              
  Lines       20463    20428      -35     
==========================================
- Hits        10294    10281      -13     
+ Misses       9029     9010      -19     
+ Partials     1140     1137       -3     

Flag	Coverage Δ
all	49.97% <33.33%> (+0.02%)	⬆️
cover	49.94% <33.33%> (+0.03%)	⬆️
crosscover	50.32% <33.33%> (+0.02%)	⬆️
update	12.62% <ø> (+0.01%)	⬆️

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	69.30% <ø> (-0.89%)	⬇️
services/management/ia/alerts_service.go	65.78% <0.00%> (+2.23%)	⬆️
services/management/ia/channels_service.go	9.25% <0.00%> (+0.16%)	⬆️
services/management/ia/rules_service.go	36.82% <0.00%> (+0.39%)	⬆️
services/management/ia/templates_service.go	46.38% <0.00%> (+0.49%)	⬆️
utils/envvars/parser.go	74.60% <ø> (+0.75%)	⬆️
services/server/server.go	34.17% <100.00%> (-0.40%)	⬇️
services/telemetry/telemetry.go	32.48% <100.00%> (ø)

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[artemgavrilov]

Let's mark IA-related fields as deprecated in API definitions. Protobuf has a special tag for that

int32 old_field = 6 [deprecated = true];

[oter]

Let's mark IA-related fields as deprecated in API definitions. Protobuf has a special tag for that

int32 old_field = 6 [deprecated = true];

@artemgavrilov PR for API created, FB updated.