chore: support to specify the continuous backup method for cluster.spec

[wangyelei]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 30.61224% with 34 lines in your changes missing coverage. Please review.

Project coverage is 64.41%. Comparing base (b20e67d) to head (40ba2ad).
Report is 2 commits behind head on release-0.9.

Files with missing lines	Patch %	Lines
pkg/dataprotection/backup/scheduler.go	0.00%	29 Missing ⚠️
...trollers/apps/transformer_cluster_backup_policy.go	83.33%	2 Missing and 1 partial ⚠️
pkg/dataprotection/restore/utils.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-0.9    #8863      +/-   ##
===============================================
- Coverage        64.45%   64.41%   -0.05%     
===============================================
  Files              359      359              
  Lines            46387    46457      +70     
===============================================
+ Hits             29900    29926      +26     
- Misses           13791    13847      +56     
+ Partials          2696     2684      -12     

Flag	Coverage Δ
unittests	64.41% <30.61%> (-0.05%)	⬇️

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