dumpling/gcs: fix http client credential problem (#395)

[ti-chi-bot]

This is an automated cherry-pick of #395

What problem does this PR solve?

cherry-pick of https://github.com/pingcap/tidb/pull/29414

What is changed and how it works?

Dumpling will fail to export data to GCS because of a lack of privileges when we set our own HTTP client without specifying transport tls. This PR deletes it.

Check List

Tests

• Unit test
• Integration test
• [x] Manual test (add detailed scripts or steps below) Test dump data with dumpling before/after this commit. Before this commit GCS will return a gcs error "google api: Error 401: anonymous caller does not have storage.object.create access to the Google Cloud Storage object.". After this commit dumpling can successfully dump data to GCS.

Related changes

• Need to cherry-pick to the release branch

Release note

• fix gcs http client credential problem

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lichunzhu

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[lichunzhu]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 65f8a89c5cdac720d05ca56ae907f05754a672a9