ebs br: print out the elapsed time for each snapshot size calculation

[BornChanger]

What problem does this PR solve?

Closes #5264

What is changed and how does it work?

This pr will directly print the elapsed time of snapshot size calculation in backup pod log.

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.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: WangLe1321

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Needs approval from an approver in each of these files:

• OWNERS [WangLe1321]

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[BornChanger]

/retest

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@503c082). Click here to learn what that means.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5263   +/-   ##
=========================================
  Coverage          ?   57.25%           
=========================================
  Files             ?      247           
  Lines             ?    29872           
  Branches          ?        0           
=========================================
  Hits              ?    17103           
  Misses            ?    11105           
  Partials          ?     1664           

Flag	Coverage Δ
unittest	57.25% <0.00%> (?)

[BornChanger]

/test pull-e2e-kind

[ti-chi-bot]

@BornChanger: The label(s) /pull-e2e-kind cannot be applied, because the repository doesn't have them.

In response to this:

/test pull-e2e-kind

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[ti-chi-bot]

@BornChanger: No presubmit jobs available for pingcap/tidb-operator@master

In response to this:

/test pull-e2e-kind

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-23 10:04:27.370804071 +0000 UTC m=+1316631.919820055: ☑️ agreed by WangLe1321.
• 2023-08-23 12:55:22.539542288 +0000 UTC m=+1326887.088558275: ✖️🔁 reset by ti-chi-bot[bot].

[ti-chi-bot]

New changes are detected. LGTM label has been removed.

[BornChanger]

/retest

[csuzhangxc]

/cherry-pick release-1.5

[ti-chi-bot]

@csuzhangxc: The label(s) /release-1.5 cannot be applied, because the repository doesn't have them.

In response to this:

/cherry-pick release-1.5

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[ti-chi-bot]

@csuzhangxc: new pull request created to branch release-1.5: #5267.

In response to this:

/cherry-pick release-1.5

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