Add group-specific integration key for PagerDuty

[achrefbensaadVPaccount]

What this is doing ?

Provides support for paging multiple teams based on the group selector while keeping backward compatibility to the old pagerduty configuration manifest

• integration per team can be specified in the integrations sections in an array form.

alerting:
  pagerduty: 
    integration-key: "00000000000000000000000000000000"
    integrations:
      - integration-key: "00000000000000000000000000000000"
        group: "team"

behavior:

• team integration have priority over the general integration (old pagerduty configuration)
• if no team integration is provided it will defaults to the general pagerduty integration
• if no team integration and no general integration were provided it defaults to the first team integration provided

[codecov-commenter]

Codecov Report

Merging #181 (5280b6c) into master (4a46a5a) will decrease coverage by 0.46%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master     #181      +/-   ##
==========================================
- Coverage   87.09%   86.63%   -0.47%     
==========================================
  Files          48       48              
  Lines        2154     2177      +23     
==========================================
+ Hits         1876     1886      +10     
- Misses        186      194       +8     
- Partials       92       97       +5     

Impacted Files	Coverage Δ
alerting/provider/pagerduty/pagerduty.go	91.89% <84.61%> (-4.27%)	⬇️
config/maintenance/maintenance.go	92.30% <0.00%> (-7.70%)	⬇️
client/client.go	74.00% <0.00%> (-2.93%)	⬇️
core/service.go	77.77% <0.00%> (-1.74%)	⬇️
storage/store/sql/sql.go	86.04% <0.00%> (-0.29%)	⬇️

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[TwiN]

@achrefbensaadVPaccount I made some adjustments in a6bc003 to support future use cases.

Namely, integrations has been renamed to overrides.

See https://github.com/TwinProduction/gatus#configuring-pagerduty-alerts

[TwiN]

Released in v3.2.2