PMM-13416 Fix enum flags in pmm-admin.

[BupycHuk]

PMM-13416

Link to the Feature Build: SUBMODULES-3737

If this PR adds or removes or alters one or more API endpoints, please review and add or update the relevant API documents as well:

• API Docs updated

If this PR is related to some other PRs in this or other repositories, please provide links to those PRs:

• Links to related pull requests (optional).

[codecov]

Codecov Report

Attention: Patch coverage is 23.63636% with 42 lines in your changes missing coverage. Please review.

Project coverage is 43.47%. Comparing base (4266c88) to head (0b883f6).
Report is 5 commits behind head on v3.

Files with missing lines	Patch %	Lines
managed/services/converters.go	64.28%	5 Missing ⚠️
admin/commands/management/add_mysql.go	0.00%	3 Missing ⚠️
admin/commands/management/add_postgresql.go	0.00%	3 Missing ⚠️
admin/commands/config.go	50.00%	1 Missing and 1 partial ⚠️
.../inventory/add_agent_qan_mysql_perfschema_agent.go	0.00%	2 Missing ⚠️
...nds/inventory/add_agent_qan_mysql_slowlog_agent.go	0.00%	2 Missing ⚠️
...ntory/add_agent_qan_postgres_pgstatements_agent.go	0.00%	2 Missing ⚠️
...tory/add_agent_qan_postgres_pgstatmonitor_agent.go	0.00%	2 Missing ⚠️
admin/commands/management/add_mongodb.go	0.00%	2 Missing ⚠️
admin/commands/management/add_proxysql.go	0.00%	2 Missing ⚠️
... and 14 more

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #3236      +/-   ##
==========================================
+ Coverage   43.45%   43.47%   +0.01%     
==========================================
  Files         362      365       +3     
  Lines       44123    44105      -18     
==========================================
  Hits        19175    19175              
+ Misses      23264    23246      -18     
  Partials     1684     1684              

Flag	Coverage Δ
admin	11.49% <7.69%> (+0.04%)	⬆️
agent	51.80% <0.00%> (ø)
managed	45.22% <66.66%> (ø)
vmproxy	68.57% <ø> (ø)

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