Add warning and confirmation before running theme doctor

[FKauwe]

WHY are these changes introduced?

Fixes #1016

Building off the architecture for a new theme doctor command in this PR, I introduce a warning and confirm with the user before executing the theme doctor test suite, as the tests will interact with user's remote shop.

WHAT is this pull request doing?

• add the renderConfirmationPrompt function to the doctor/theme/index.ts file
• add a new unittest file and 2 unittests to verify that behavior for User Confirms and User Cancels are correct

looks like this when User Confirms(test suite executes):

and when User Cancels (exit the command):

UPDATE: working with the addition of the required environment variable, I verified the variable requirement executes first and then the prompt and confirmation.
If the correct env variable is present:

If the incorrect variable is present:

I also wrote a new unittest to confirm this behavior.

How to test your changes?

pull my branch down locally
p build
run shopify-dev doctor theme -e <local-env-name> in external terminal
see the warning and prompt and the expected behaviors between Yes/No

[EvilGenius13]

Great start @FKauwe!
Two things

• Let's rebase with my branch as there were some changes and we should make sure everything still runs well.
• Can we amend the message a little bit? Maybe add that some commands will change code within themes.

[FKauwe]

Great start @FKauwe! Two things

• Let's rebase with my branch as there were some changes and we should make sure everything still runs well.
• Can we amend the message a little bit? Maybe add that some commands will change code within themes.

Yes to both! How will the commands change code within the themes? (I want to be specific with the message: "this command will change code within <which?> themes in <what ways?> "
Or, if there's a specific message you want me to use, I'm happy to

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	78.99%	14574/18450
🟡	Branches	73.28%	7229/9865
🟡	Functions	79.16%	3707/4683
🟡	Lines	79.35%	13781/17368

Test suite run success

3774 tests passing in 1454 suites.

Report generated by 🧪jest coverage report action from ddeabf9

[EvilGenius13]

Changes look good! 🎩 went well. You can remove the changeset as this won't be used by users externally.

[github-actions]

We detected some changes at packages/*/src and there are no updates in the .changeset.
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