Enable copy for code blocks

[ReToCode]

Context: https://cloud-native.slack.com/archives/C04LY5G9ED7/p1704358780773299

Proposed Changes

• Enables copy buttons on code (shell) blocks

/assign @skonto

[knative-prow]

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[ReToCode]

/cherry-pick release-1.12

[knative-prow-robot]

@ReToCode: once the present PR merges, I will cherry-pick it on top of release-1.12 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.12

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[skonto]

Out of curiosity do we want to have this button everywhere or just with bash commands (starting with ```bash)? Right now it is everywhere. Does not hurt imho (checked other projects eg. Istio which have the same). WDYTH?

[skonto]

/lgtm

[knative-prow-robot]

@ReToCode: new pull request created: #5808

In response to this:

/cherry-pick release-1.12

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ReToCode]

Out of curiosity do we want to have this button everywhere or just with bash commands (starting with ```bash)? Right now it is everywhere. Does not hurt imho (checked other projects eg. Istio which have the same). WDYTH?

I think it would be sufficient for bash, but seems this is the way mkdocs works. Not sure if we could tweak every place we have a code block somehow.