br: backup command with parameter s3 endpoint has suffix '/'

[fengou1]

What problem does this PR solve?

backup failure when parameter s3 endpoint with suffix '/'
Issue Number: close #30104

Problem Summary:
AWS and mini support URL has suffix '/', however BR endpoint has suffix will failure.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

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• kennytm

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[kennytm]

LGTM, but i think the if len(qs.Endpoint) > 0 check is useless since TrimSuffix("", "/") == "" anyway.

[fengou1]

LGTM, but i think the if len(qs.Endpoint) > 0 check is useless since TrimSuffix("", "/") == "" anyway.

agreed, remove this check.

[fengou1]

Duplicate with #30144 , close this one.