chore: add config for spell checker action, fix typos

[mowies]

Description

This PR introduces configuration for the check-spelling/check-spelling GH action that will be added in #2316.
Also, it fixes any errors that are present in the repo right now.

All the spell checker config is under .github/actions/spelling.

Part of #2291

How to test

A successful run (except for an arbitrarily introduced grammar error for PR creation) can be found here: Link

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[codecov]

Codecov Report

Merging #2443 (b418730) into main (3185943) will increase coverage by 0.02%.
Report is 2 commits behind head on main.
The diff coverage is 85.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2443      +/-   ##
==========================================
+ Coverage   85.68%   85.71%   +0.02%     
==========================================
  Files         161      161              
  Lines       10201    10201              
==========================================
+ Hits         8741     8744       +3     
+ Misses       1188     1186       -2     
+ Partials      272      271       -1     

Files	Coverage Δ
...-operator/apis/lifecycle/v1alpha2/common/phases.go	100.00% <ø> (ø)
...-operator/apis/lifecycle/v1alpha3/common/common.go	100.00% <ø> (ø)
...ollers/common/providers/keptnmetric/keptnmetric.go	90.00% <100.00%> (ø)
...rator/controllers/common/taskdefinition/handler.go	100.00% <ø> (ø)
...controllers/lifecycle/keptntask/runtime_builder.go	70.44% <100.00%> (ø)
...controllers/common/analysis/objective_evaluator.go	100.00% <ø> (ø)
metrics-operator/converter/common.go	100.00% <100.00%> (ø)
metrics-operator/converter/sli_converter.go	96.20% <100.00%> (ø)
metrics-operator/converter/slo_converter.go	94.71% <100.00%> (ø)
klt-cert-manager/pkg/certificates/watcher.go	59.74% <50.00%> (ø)
... and 1 more

... and 2 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	67.43% <50.00%> (ø)
component-tests	56.33% <0.00%> (-0.35%)	⬇️
keptn-lifecycle-operator	?
lifecycle-operator	86.24% <100.00%> (ø)
metrics-operator	87.58% <100.00%> (ø)
scheduler	32.12% <33.33%> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
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