Change stored version to v1beta3

[andriisoldatenko]

Description

This PR has all changes requires to use stored version as v1beta3 including:

• Replace "github.com/Dynatrace/dynatrace-operator/pkg/api/v1beta2/dynakube" to "github.com/Dynatrace/dynatrace-operator/pkg/api/v1beta3/dynakube" mostly everywhere, except few files;
• move conversion logic to v1beta3 package;

How can this be tested?

Make sure we store every CR (dynakube) using v1beta3, some testing ideas:

• Apply dynakube v1beta1 -> stored as v1beta3
• Apply dynakube v1beta2 -> stored as v1beta3
• Apply dynakube v1beta3 -> stored as v1beta3

Optional:

• Install the previous release, add dynakube v1beta2, and then upgrade the operator using this PR.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 88.43931% with 40 lines in your changes missing coverage. Please review.

Project coverage is 57.68%. Comparing base (b6b9122) to head (965bd51).

Files	Patch %	Lines
pkg/api/v1beta3/dynakube/validation/validation.go	50.00%	13 Missing ⚠️
pkg/api/v1beta3/dynakube/validation/oneagent.go	92.95%	3 Missing and 2 partials ⚠️
pkg/api/v1beta3/dynakube/dynakube_webhook.go	0.00%	3 Missing ⚠️
pkg/api/v1beta3/dynakube/validation/api_url.go	89.65%	2 Missing and 1 partial ⚠️
cmd/webhook/builder.go	0.00%	2 Missing ⚠️
pkg/api/v1beta2/dynakube/convert_from.go	84.61%	1 Missing and 1 partial ⚠️
.../v1beta2/dynakube/validation/namespace_selector.go	66.66%	1 Missing and 1 partial ⚠️
pkg/api/v1beta3/dynakube/dynakube_status.go	0.00%	2 Missing ⚠️
...g/api/v1beta3/dynakube/validation/csi_daemonset.go	87.50%	1 Missing and 1 partial ⚠️
pkg/api/v1beta3/dynakube/validation/istio.go	77.77%	1 Missing and 1 partial ⚠️
... and 3 more

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3463      +/-   ##
==========================================
+ Coverage   57.28%   57.68%   +0.39%     
==========================================
  Files         344      354      +10     
  Lines       19796    20006     +210     
==========================================
+ Hits        11340    11540     +200     
- Misses       7216     7226      +10     
  Partials     1240     1240              

Flag	Coverage Δ
unittests	57.68% <88.43%> (+0.39%)	⬆️

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[0sewa0]

Only a partial review, didn't check everything yet
Checked all files, no further comments

[0sewa0]

tested scenarios: (all cloudnative)

• Upgrade from main with a previous DynaKube present
• Apply v1beta2 DynaKube
• Apply v1beta3 DynaKube