ui: Use native functionality for clipboard functionality, but keep a fallback

[johncowen]

We recently re-wrote our copy to clipboard functionality to use a non-visual modifier, more details in https://github.com/hashicorp/consul/pull/10511.

@nfagerlund pointed out that we could be using the newer native browser functionality here, so we decided to tweak this a little more to use that instead of ClipboardJS. Our targeted browsers still fall within versions that do not support the newer native browser functionality as yet, so we keep a ClipboardJS polyfill here just incase, but only load that code for folks without window.navigator.clipboard support. End user (engineer) usage is the same for both.

Additionally we noticed we actually ignored our tests around this due to ember-tooltip being problematic https://github.com/hashicorp/consul/pull/8117#discussion_r440800963

We got rid of ember-tooltip a while back and replaced it with our own tooltip modifier, so we un-ignored that test here also (health-check spelling had also changed since then)

We made the service injection slightly less brittle here seeing as we are now switching between 3 implementations instead of just 2, but we can probably make this even better if we move to this to an addon (addons have features/capabilities that aren't available to applications). There also seems to be some interest from other products/folks in using this so we'll leave this as a relatively soon "to be done"/ additional PR.

~I've just noticed one last thing that is potentially a non-user facing engineering bug also 👀 , but that shouldn't block review.~ Ah no it failed tests, awesome, will fix that up now.

P.S. just incase, I've added a no changelog label here also, but I'll add in the final PR where we actually change the user facing feature

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