Update tutorial_qnn_module_tf after the deprecation of qml.qnn.KerasLayer

[JerryChen97]

Context:
KerasLayer has been already deprecated in PennyLane master branch (see PennyLaneAI/pennylane#7097). This PR updates the tutorial_qnn_module_tf demo that relies on KerasLayer in Keras2.

Summary:
Converted the mentioned demo into non-executable. As a result, the following changes to output were made:

• Uploaded our previous scatter plot figure into _static and show in the first output
• Hardcoded the TF/Keras fitting output printing info as the second and third output
• Removed those TF warnings that used to exist. Users shall still get these warnings printing if they run on their own

Added user warning on the top of tutorial_qnn_module_tf.

Inplace warning catchers for wherever the KerasLayer was used.

Relevant references:

Possible Drawbacks:

Related GitHub Issues:
[sc-86997]

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• GOALS — Why are we working on this now?

  Eg. Promote a new PL feature or show a PL implementation of a recent paper.

• AUDIENCE — Who is this for?

  Eg. Chemistry researchers, PL educators, beginners in quantum computing.

• KEYWORDS — What words should be included in the marketing post?

• Which of the following types of documentation is most similar to your file?
  (more details here)

• Tutorial
• Demo
• How-to

[github-actions]

👋 Hey, looks like you've updated some demos!

🐘 Don't forget to update the dateOfLastModification in the associated metadata files so your changes are reflected in Glass Onion (search and recommendations).

Please hide this comment once the field(s) are updated. Thanks!

[github-actions]

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Deployment Info:

• Pull Request ID: 1334
• Deployment SHA: dcb612dea9c2c8c49ca6b6bd17177eb75b751a4d
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[josh146]

Thanks @JerryChen97. Rather than making this demo catch warnings, let's make it non-executable (will need to add codeblocks to represent the output like other non-executable demos).

I've updated the warning in a comment to reflect this.

[JerryChen97]

Thanks @JerryChen97. Rather than making this demo catch warnings, let's make it non-executable (will need to add codeblocks to represent the output like other non-executable demos).

I've updated the warning in a comment to reflect this.

@josh146 I am checking how_to_catalyst_lightning_gpu.py as example. Is this a good reference for our purpose?

[JerryChen97]

This demo has three actual outputs.
Two are numbers (used to be followed by bunch of TF warnings)
One is the plt scatter plot.
I plan to hard code the two numbers, and upload the current official figure to our static resource to refer to later

[PietropaoloFrisoni]

Thanks a lot Yushao! Hopefully this will fix the dev branch before the release 👍

[albi3ro]

Can we uncomment the code now?

[albi3ro]

Thanks for the updates.