fix(CodeEditor): hide button and link when read-only

[mfrances17]

What: Closes #9537

Added code to conditionally remove the footer (Browse btn and Start from scratch link) when it's a read-only code editor. Also removed some leftover console.logs that were being sent on mounts in order to clean up the console on load.

To test, pass isReadOnly to the code editor in the Code Editor with Actions example and verify that the button and link are no longer present.

Note that there is an exception thrown on load of the code editor examples - this was pre-existing and is fixed by a separate PR: #9665

[patternfly-build]

Preview: https://patternfly-react-pr-9668.surge.sh

A11y report: https://patternfly-react-pr-9668-a11y.surge.sh

[thatblindgeye]

This looks good. One possible reason for keeping those console logs might be to show how to get the editor value for some other use, but not a blocker to me; @nicolethoen do you recall the original intent of the console logs that are removed in this PR?

Unrelated to the linked issue, but something we may want to look into as a followup: it doesn't look like the logic for the emptyState var is working as intended. Currently on the return on line ~645 (from the current code, not in this PR), we're only rendering code that includes the emptyState if isUploadEnabled || providedEmptyState. When we declare the emptyState var on line ~519, we're assigning it either the consumer's custom providedEmptyState (from the emptyState prop), or assigning it a default based on a ternary depending on whether isUploadEnabled is true or not (if true, render the browse button + "start from scratch" button, otherwise just the "start from scratch" button).

So if we have a CodeEditor that has no code value, no emptyState prop value, and isUploadEnabled is false, the expectation seems to be that we render a default empty state with just a "Start from scratch" button (or whatever is passed to the emptyStateLink prop), like the following screenshot:

Currently what happens is the code editor just renders since the condition in that returned ternary (isUploadEnabled || providedEmptyState) is false.

[tlabaj]

lgtm