Safely parse color string

[antonis]

Fixes https://github.com/wordpress-mobile/WordPress-Android/issues/20694 and https://github.com/wordpress-mobile/WordPress-Android/issues/20698

Related PRs:

• https://github.com/wordpress-mobile/WordPress-Android/pull/20704

Fix

This PR adds exception handling for the Color.parseColor function call to prevent the app from crashing. Similar handling is done in two other case in Aztec (one, two)

Test

I was not able to reproduce the crash thus I suggest a sanity check of the functionality introduced in https://github.com/wordpress-mobile/AztecEditor-Android/pull/1073

Make sure strings will be translated:

• [x] If there are new strings that have to be translated, I have added them to the client's strings.xml as a part of the integration PR.