Slightly imporved pyrepl

[WebReflection]

Description

This PR slightly simplifies some dance around py-repl component without tackling other concerns we still need to discuss. The code has been cleaned up a bit, simplified, and it should be less error prone.

Changes

• removed unnecessary getAttribute
• removed unnecessary shadow and ShadowDOM in general, as it was never used
• dropped redundant constructor
• reused addReplAttribute for both attributes
• removed unnecessary usage of the label element + fixed redundant always-same buttons IDs

Checklist

• All tests pass locally
• I have updated docs/changelog.md
• I have created documentation for this(if applicable)

[WebReflection]

Ooops, sorry folks, marked as WIP due errors I didn't spot locally ... investigating.

edit dropped WIP

[antocuni]

LGTM, but it needs rebasing.
Let me know when it's ready to be merged, thanks

[marimeireles]

Cool! Thank you :)

[WebReflection]

@antocuni there were a lot of conflicts after rebase + I can't use my local repo anymore ... I hope the resolved file works as expected. I am investigating what's going on in my fork.

update I'v esolved GitHub issue and tested locally all things are fine ... if CI is happy, this is ready to be merged.