refactor: replace route's format with pattern in [StaticBadge] & modified [website]

[jNullj]

static-badge is the LAST to have format transformed to pattern!
after this is done and merged i will create one last PR to remove all code, tests and docs related to the old deprecated format then we could complete #3329.

i modified the code in website as well to reuse the same code in an helper module and added tests.
we should consider performance here as well

i suspect that splitDashSeparatedOptionalParams could in theory be faster then regex, but i should test this to be sure, maybe regex libs has some optimization im not using, maybe we could optimize splitDashSeparatedOptionalParams somehow.

other changes:

• We now present a an invalid parameter error when user uses incorrect format instead of 404.
• Brake support for the missing message format, label--blue which is still supported with the same render using label- -blue (not in wide use)

[github-actions]

	Warnings
⚠️	This PR modified service code for website but not its test code. That's okay so long as it's refactoring existing code.

	Messages
📖	✨ Thanks for your contribution to Shields, @jNullj!

Generated by 🚫 dangerJS against fa11e0e

[jNullj]

A few things to consider in the review

1. We now present a an invalid parameter error when user uses incorrect format instead of 404.
2. I brake here support for the missing message format, label--blue which is still supported with the same render using label- -blue

why brake support for missing message?
our docs never supported it, we clearly state that -- is output as -, this syntax is not very consistent and i find it confusing.
using a space to separate the too gives the same badge but has clear intent for an empty message and is consistent with our logic of - - =/= -- so it should not escape into -.

i hate it being a braking change, but i think its not in wide use, look at this search over github only 262 results show up and this include all -- usage, most of them are for 3 parts usage and are not relevant to this change

[jNullj]

this is undocumented, so i think its better as a redirect with its own path rather then adding logic to usage of badgeContent of the service

[jNullj]

This is hardly in use, users get the exact same result using a space - - instead of --.
This was not consistent with our docs and logic of escaping -- => -. So i find the that confusing and think we should drop support. for label--color syntax in favor of using label- -color

[jNullj]

This is now a helper function shared with Website