[WIP] chore: refactor Konnect configuration synchronization

[czeslavo]

What this PR does / why we need it:

Which issue this PR fixes:

Special notes for your reviewer:

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

Attention: Patch coverage is 9.75610% with 111 lines in your changes missing coverage. Please review.

Project coverage is 60.8%. Comparing base (655e921) to head (082fa02).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/konnect/config_synchronizer.go	0.0%	76 Missing ⚠️
internal/adminapi/konnect.go	0.0%	14 Missing ⚠️
internal/dataplane/kongstate/credentials.go	0.0%	4 Missing ⚠️
internal/manager/run.go	33.3%	4 Missing ⚠️
internal/dataplane/deckgen/deckgen.go	40.0%	2 Missing and 1 partial ⚠️
internal/dataplane/kong_client.go	70.0%	3 Missing ⚠️
internal/manager/setup.go	0.0%	3 Missing ⚠️
internal/dataplane/kongstate/uuid.go	0.0%	2 Missing ⚠️
internal/dataplane/kongstate/license.go	0.0%	1 Missing ⚠️
internal/dataplane/kongstate/types.go	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #6764      +/-   ##
========================================
- Coverage   77.0%   60.8%   -16.2%     
========================================
  Files        211     211              
  Lines      25484   25506      +22     
========================================
- Hits       19623   15515    -4108     
- Misses      4847    8689    +3842     
- Partials    1014    1302     +288     

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[team-k8s-bot]

E2E (targeted) tests with KIND-based clusters were started at https://github.com/Kong/kubernetes-ingress-controller/actions/runs/12155124324