Return standard interval for checks that don't have it specified

[artemgavrilov]

PMM-0

Build: SUBMODULES-2769

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[codecov[bot]]

Codecov Report

Merging #1209 (88724cb) into main (1819898) will increase coverage by 0.33%. The diff coverage is 100.00%.

:exclamation: Current head 88724cb differs from pull request most recent head 6c7d2f9. Consider uploading reports for the commit 6c7d2f9 to get more accurate results

@@            Coverage Diff             @@
##             main    #1209      +/-   ##
==========================================
+ Coverage   43.50%   43.84%   +0.33%     
==========================================
  Files         355      353       -2     
  Lines       41908    41590     -318     
==========================================
+ Hits        18234    18237       +3     
+ Misses      22078    21760     -318     
+ Partials     1596     1593       -3     

Flag	Coverage Δ
managed	45.71% <100.00%> (+0.41%)	:arrow_up:

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

Impacted Files	Coverage Δ
managed/services/management/checks.go	76.49% <100.00%> (+1.84%)	:arrow_up:
managed/services/dbaas/kubernetes/kubernetes.go	0.00% <0.00%> (ø)
...ed/services/dbaas/kubernetes/client/load_config.go
...vices/dbaas/kubernetes/client/database/database.go
agent/agents/mysql/slowlog/slowlog.go	51.17% <0.00%> (+2.98%)	:arrow_up:
.../agents/mongodb/internal/profiler/sender/sender.go	82.25% <0.00%> (+3.22%)	:arrow_up:
managed/services/dbaas/kubernetes/client/client.go	26.66% <0.00%> (+8.69%)	:arrow_up:
agent/runner/runner.go	81.43% <0.00%> (+8.98%)	:arrow_up:

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