chore(gae): delete 'flask' samples from standard folder

[eapl-gemugami]

Description

Fixes Internal:
b/347349937
b/347350892
b/347350807

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• Please merge this PR for me once it is approved

[code-review-assist]

Hi team,

I'm currently reviewing this pull request and will provide feedback shortly. In the meantime, here's a summary for you and other reviewers to quickly get up to speed:

This pull request, chore(gae): delete 'flask' samples from standard folder, aims to remove the Flask samples from the App Engine standard folder. The description mentions it fixes internal issues b/347349937, b/347350892, and b/347350807.

The following files were modified:

• appengine/standard/flask/hello_world/.gitignore - The lib entry was removed.
• appengine/standard/flask/hello_world/README.md - The entire file was deleted.
• appengine/standard/flask/hello_world/app.yaml - The entire file was deleted.
• appengine/standard/flask/hello_world/main.py - The entire file was deleted.
• appengine/standard/flask/hello_world/main_test.py - The entire file was deleted.
• appengine/standard/flask/tutorial/.gitignore - The lib entry was removed.
• appengine/standard/flask/tutorial/README.md - The entire file was deleted.
• appengine/standard/flask/tutorial/app.yaml - The entire file was deleted.
• appengine/standard/flask/tutorial/appengine_config.py - The entire file was deleted.
• appengine/standard/flask/tutorial/main.py - The entire file was deleted.
• appengine/standard/flask/tutorial/main_test.py - The entire file was deleted.
• appengine/standard/flask/tutorial/requirements-test.txt - The entire file was deleted.
• appengine/standard/flask/tutorial/requirements.txt - The entire file was deleted.
• appengine/standard/flask/tutorial/static/style.css - The entire file was deleted.
• appengine/standard/flask/tutorial/templates/form.html - The entire file was deleted.
• appengine/standard/flask/tutorial/templates/submitted_form.html - The entire file was deleted.

Essentially, this PR completely removes the Flask-based samples from the App Engine standard directory.

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Here's a little haiku to lighten the mood:

Code flows like a stream,
Deleting files, clean and swift,
A simpler program.

[code-review-assist]

This pull request removes the Flask samples from the appengine/standard directory. This change aligns with the deprecation of Python 2.7, which is required for these samples, in App Engine standard. Removing these outdated samples helps to maintain the relevance and clarity of the repository. The changes are well-organized and straightforward. The updated README for the appengine/standard directory clearly reflects the removal of the Flask samples, which is good. The commit messages are clear and concise, and the pull request description provides sufficient context and references the relevant internal bug reports. Overall, this is a well-executed cleanup effort.

I noticed that the PR description mentions following sample guidelines, but the checklist item for updating the README is not checked. Since the appengine/standard/README.md file is affected by this change, it should be updated to reflect the removal of the Flask samples. I've included a suggestion for the README update below.

[snippet-bot]

Here is the summary of changes.

You are about to delete 8 region tags.

• appengine/standard/flask/tutorial/app.yaml:23, tag handlers
• appengine/standard/flask/tutorial/appengine_config.py:15, tag vendor
• appengine/standard/flask/tutorial/main.py:15, tag app
• appengine/standard/flask/tutorial/main.py:18, tag imports
• appengine/standard/flask/tutorial/main.py:23, tag create_app
• appengine/standard/flask/tutorial/main.py:28, tag form
• appengine/standard/flask/tutorial/main.py:37, tag submitted
• appengine/standard/flask/tutorial/main.py:46, tag render_template

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