Improve getKeys script to ignore comments and trim keys

[GeorgeNgMsft]

Adding a filter to ignore comments when running getKeys.readDotenv and handle scenarios such as using "#-------------------" for a page break.

For example :

Also added some minor k/v trimming + CRLF handling

[GeorgeNgMsft]

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[Copilot]

Pull request overview

This PR updates the getKeys developer script’s .env parsing to avoid treating comment/blank lines as key/value entries, improving compatibility with .env files that include separators like #-------------------.

Changes:

• Filter out empty lines and full-line # comments when reading .env in readDotenv().
• Keep the existing key/value splitting logic for non-comment lines.

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