Misc bug fixes for Bitbucket

[AlexTugarev]

• fix response codes for webhook events, so that they are not resent whenever we answer with code 5xx. cf. https://support.atlassian.com/bitbucket-cloud/docs/troubleshoot-webhooks/
• don't log notice message

This PR doesn't add new features.

NONE

[codecov]

Codecov Report

Merging #8298 (d636e03) into main (6497329) will decrease coverage by 20.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #8298       +/-   ##
===========================================
- Coverage   31.23%   11.17%   -20.06%     
===========================================
  Files          39       18       -21     
  Lines        5910      993     -4917     
===========================================
- Hits         1846      111     -1735     
+ Misses       3923      880     -3043     
+ Partials      141        2      -139     

Flag	Coverage Δ
components-gitpod-cli-app	11.17% <ø> (ø)
components-local-app-app-darwin-amd64	?
components-local-app-app-darwin-arm64	?
components-local-app-app-linux-amd64	?
components-local-app-app-linux-arm64	?
components-local-app-app-windows-386	?
components-local-app-app-windows-amd64	?
components-local-app-app-windows-arm64	?
components-supervisor-app	?

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Impacted Files	Coverage Δ
components/supervisor/pkg/supervisor/supervisor.go
components/supervisor/pkg/supervisor/user.go
components/supervisor/pkg/supervisor/services.go
components/supervisor/pkg/ports/served-ports.go
components/supervisor/pkg/config/gitpod-config.go
components/local-app/pkg/auth/auth.go
components/supervisor/pkg/terminal/service.go
components/supervisor/pkg/supervisor/ssh.go
...mponents/supervisor/pkg/supervisor/notification.go
components/supervisor/pkg/ports/ports-config.go
... and 11 more

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[geropl]

Code LGTM