feat: enable self service notification support

[zachaller]

Allow rollouts to define configuration for notification engine in the namespace of the rollout resource.

[github-actions]

Go Published Test Results

2 030 tests   2 030 ✔️  2m 39s ⏱️
   118 suites         0 💤
       1 files           0 ❌

Results for commit 444b80a.

♻️ This comment has been updated with latest results.

[github-actions]

E2E Tests Published Test Results

    4 files      4 suites   3h 44m 54s ⏱️
102 tests   82 ✔️   6 💤 14 ❌
432 runs  385 ✔️ 24 💤 23 ❌

For more details on these failures, see this check.

Results for commit 444b80a.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Patch coverage: 90.19% and project coverage change: -0.01 ⚠️

Comparison is base (20e00e4) 81.68% compared to head (444b80a) 81.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2869      +/-   ##
==========================================
- Coverage   81.68%   81.67%   -0.01%     
==========================================
  Files         133      133              
  Lines       20309    20310       +1     
==========================================
  Hits        16589    16589              
- Misses       2862     2863       +1     
  Partials      858      858              

Impacted Files	Coverage Δ
utils/record/record.go	79.75% <61.53%> (-0.34%)	⬇️
controller/controller.go	89.53% <100.00%> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
18.0% Duplication