Skip whitespace removal for multiline pastes

[serd2011]

Summary of the Pull Request

Skips whitespace removal if pasted string is multiline

PR Checklist

• [x] Closes #12387
• [x] CLA signed. If not, go over here and sign the CLA
• [x] Tests added/passed
• [ ] Documentation updated. If checked, please file a pull request on our docs repo and link it here: #xxx
• [ ] Schema updated.
• [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Validation Steps Performed

Tests passed The last command in multiline paste now executes

[serd2011]

I don't really see why tabs should be treated differently. Am I missing something?

[lhecker]

(I've fixed a small grammatical error in the PR title.)

[ghost]

Hello @zadjii-msft!

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[ghost]

:tada:Windows Terminal Preview v1.16.252 has been released which incorporates this pull request.:tada:

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