🌱 Define a constant for the finaliser key

[m1kola]

Description

Moving finaliser key to a constant instead of dynamically generating it. We do it the same way in catalod. Another finalisers will be added in #1207 in a similar way.

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.53%. Comparing base (39c893c) to head (e0f0ccf).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/manager/main.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #1209 +/- ##
==========================================
- Coverage 77.55% 77.53% -0.03% 
==========================================
Files 36 36 Lines 1978 1976 -2 ==========================================
- Hits 1534 1532 -2 
Misses 309 309 Partials 135 135 

Flag	Coverage Δ
e2e	57.59% <50.00%> (-0.05%)	⬇️
unit	55.61% <0.00%> (+0.05%)	⬆️

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[tmshort]

/lgtm