Allow keyword-based name argument for remove_concurrent_index_by_name

What does this MR do?

Allows keyword name for remove_concurrent_index_by_name

• Arguments for remove_concurrent_index_by_name are sometimes used wrongly.
• This one allows keyword arguments for index name:

Issue #226985 (closed)

remove_concurrent_index_by_name TABLE_NAME, name: INDEX_NAME
remove_concurrent_index_by_name TABLE_NAME, INDEX_NAME

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
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• Style guides
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Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

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• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
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