br: fix backup to aliyum OSS not support ak/sk as env

[RidRisR]

What problem does this PR solve?

Issue Number: close https://github.com/pingcap/tidb/issues/45551

Problem Summary:

What changed and how does it work?

Fix the problem that BR only accept credentials from ISM service. Now, if the BR can't get the ISM credentials, it will try to retrieve credentials from other sources. And even if it got, it will still try to apply env provider and then shared provider first.

Check List

Tests

• [ ] Unit test
• [ ] Integration test
• [x] Manual test (add detailed scripts or steps below)
• [ ] No need to test

  • [ ] I checked and no code files have been changed.

Protocol:

1. Set access-key and secret-access-key as my local machine environmental variable.
2. Try br backup full from a public address (my local machine) without ISM access-key.
3. Check if the full backup task finished and if the Aliyun OSS server received the backup files.

Result:

1. On my local machine:

./bin/br backup full     --pd "localhost:45129"     --storage "s3://test-cred/backup-data-2?endpoint=https://oss-cn-beijing.aliyuncs.com&provider=alibaba" --check-requirements=false
Detail BR log in /tmp/br.log.2024-06-27T15.12.35+0800 
Full Backup <------------------------------------------------------------------> 100.00%
Checksum <---------------------------------------------------------------------> 100.00%
[2024/06/27 15:13:10.064 +08:00] [INFO] [collector.go:77] ["Full Backup success summary"
] [total-ranges=13] [ranges-succeed=13] [ranges-failed=0] [backup-checksum=75.981913ms] [backup-fast-checksum=59.160314ms] [backup-total-ranges=119] [backup-total-regions=119] [total-take=34.226278783s] [BackupTS=450749369217187841] [total-kv=1402] [total-kv-size=409kB] [average-speed=11.95kB/s] [backup-data-size(after-compressed)=92.64kB] [Size=92636]                                                                                      

2. On the Aliyun OSS machine

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

Please refer to Release Notes Language Style Guide to write a quality release note.

Fix the problem that BR only accept credentials from ISM service.
Now, if the BR can't get the ISM credentials, it will behave as same as other endpoints and try to retrieve credentials from other sources. 
And even if it got, it will still try to apply env provider and then shared provider first.

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Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 57.2932%. Comparing base (31c1de0) to head (246b973). Report is 968 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54150         +/-   ##
=================================================
- Coverage   72.8144%   57.2932%   -15.5213%     
=================================================
  Files          1524       1677        +153     
  Lines        435824     620323     +184499     
=================================================
+ Hits         317343     355403      +38060     
- Misses        98833     240630     +141797     
- Partials      19648      24290       +4642     

Flag	Coverage Δ
integration	40.0761% <0.0000%> (?)
unit	72.3097% <0.0000%> (+0.4908%)	:arrow_up:

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Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	63.0778% <0.0000%> (+16.9462%)	:arrow_up:

[RidRisR]

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Leavrth, YuJuncen

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Timeline:

• 2024-06-27 07:24:51.388011506 +0000 UTC m=+877217.873500339: :ballot_box_with_check: agreed by YuJuncen.
• 2024-06-28 06:32:57.239023914 +0000 UTC m=+960503.724512746: :ballot_box_with_check: agreed by Leavrth.

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