Strip username before login and add unit test within test_post_login

[sweep-ai]

Description

This PR addresses the issue of spaces being kept at the beginning and end of the username's Textbox on the login page in gradio. The proposed solution is to modify the login route in the gradio/routes.py script to strip the username input before processing it. This will remove any leading or trailing spaces from the username, resolving the issue of spaces causing login problems.

Summary of Changes

• Modified the login route in gradio/routes.py to apply the strip() method to the username input.
• Updated the line username, password = form_data.username, form_data.password to username, password = form_data.username.strip(), form_data.password.
• Added a unit test within test_post_login to verify the stripping of spaces from the username input.

Please review and merge this PR. Thank you!

Fixes #5056.

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To checkout this PR branch, run the following command in your terminal:

git checkout sweep/strip-username-login

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Name	Status	Preview	Updated (UTC)
gradio	✅ Ready (Inspect)	Visit Preview	Aug 4, 2023 4:02pm

[sweep-ai]

GitHub actions yielded the following error.

The command that failed is:

cat CHANGELOG.md client/python/CHANGELOG.md | grep -w "https://github.com/gradio-app/gradio/pull/5096"

Here are the relevant lines from the logs:

##[group]Run cat CHANGELOG.md client/python/CHANGELOG.md | grep -w "https://github.com/gradio-app/gradio/pull/5096"
�[36;1mcat CHANGELOG.md client/python/CHANGELOG.md | grep -w "https://github.com/gradio-app/gradio/pull/5096"�[0m
shell: /usr/bin/bash -e {0}
##[endgroup]
##[error]Process completed with exit code 1.

This is likely a linting or type-checking issue with the source code.

[gradio-pr-bot]

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