source-file: add support for sheet_name in openpyxl_chunk_reader

[lleadbet]

What

The source-file connector's Reader Options supports the ability to pass in Panda options to the related type of data. This works for most types, as we use the underlying Panda function, however for Excel files we use a custom openpyxl_chunk_reader by default which does not.

This PR adds rudimentary support for sheet_name in the custom function to keep things consistent with our documentation, as well as allowing users to select a sheet to use (or more).

Our general implementation doesn't fully abide by Pandas's in that it notably flattens all columns whereas Pandas's does not, but it keeps it more consistent with our existing behavior.

How

Adds explicit support for the arg with basic filtering logic.

Review guide

Validate it works correctly.

User Impact

No changes for existing users.

Can this PR be safely reverted and rolled back?

• YES 💚
• NO ❌

[github-actions]

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[github-actions]

source-file Connector Test Results

67 tests   62 ✅  11s ⏱️
 2 suites   5 💤
 2 files     0 ❌

Results for commit 548b02b.

[lleadbet]

Closing in favor of #69774.