ebs br: make snapshot size calculation optional

[BornChanger]

What problem does this PR solve?

Close #5201
Close #5212

What is changed and how does it work?

This pr introduced an option 'calcSizeLevel' in backup spec to claim if calculate backup snapshot size or not, and calculate which part of snapshot sizes.

• 'all' (default) : calculate both full and incremental size; ''
• 'full' : calculate full size
• 'incremental': calculate incremental size
• 'disabled': skip size calculation

apiVersion: pingcap.com/v1alpha1
kind: Backup
metadata:
  name: zm-dataplane-a
  namespace: backup-a
spec:
  backoffRetryPolicy:
    maxRetryTimes: 2
    minRetryDuration: 300s
    retryTimeout: 30m
  backupMode: volume-snapshot
  backupType: full
  br:
    cluster: db-a
    clusterNamespace: backup-a
    sendCredToTikv: false
  cleanPolicy: Delete
  calcSizeLevel: disabled | full | incremental | all
  resources: {}
  s3:
    bucket: wangle-ebs-test-us-west-2
    prefix: backup-20230704
    provider: aws
    region: us-west-2
  serviceAccount: tidb-backup-manager

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[BornChanger]

/test pull-e2e-kind-br

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[codecov-commenter]

Codecov Report

Merging #5202 (6375837) into master (899409c) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5202      +/-   ##
==========================================
- Coverage   57.79%   57.78%   -0.02%     
==========================================
  Files         245      245              
  Lines       29327    29338      +11     
==========================================
+ Hits        16951    16954       +3     
- Misses      10726    10735       +9     
+ Partials     1650     1649       -1     

Flag	Coverage Δ
unittest	57.78% <0.00%> (-0.02%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csuzhangxc

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-07-26 08:06:51.376081962 +0000 UTC m=+341753.970612947: ☑️ agreed by csuzhangxc.
• 2023-07-27 02:42:02.703672469 +0000 UTC m=+408665.298203459: ✖️🔁 reset by BornChanger.

[ti-chi-bot]

New changes are detected. LGTM label has been removed.

[BornChanger]

/cherry-pick release-1.5

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[BornChanger]

/retest

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@BornChanger: new pull request created to branch release-1.5: #5214.

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