Add restriction to only allow one customer account page render per extension

[brianshen1990]

WHY are these changes introduced?

Post-release steps

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[github-actions]

Thanks for your contribution!

Depending on what you are working on, you may want to request a review from a Shopify team:

• Themes: @shopify/advanced-edits
• UI extensions: @shopify/ui-extensions-cli
  • Checkout UI extensions: @shopify/checkout-ui-extensions-api-stewardship
• Hydrogen: @shopify/hydrogen
• Other: @shopify/app-inner-loop

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	73.02% (-0.07% 🔻)	8391/11492
🟡	Branches	69.57% (-0% 🔻)	4095/5886
🟡	Functions	71.75% (-0.12% 🔻)	2179/3037
🟡	Lines	73.36% (-0.07% 🔻)	7940/10823

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🔴	... / marketing_activity.ts	25% (-75% 🔻)	100%	0% (-100% 🔻)	25% (-75% 🔻)
🟢	... / conf-store.ts	100%	90.24% (-2.44% 🔻)	100%	100%
🟡	... / session.ts	76.92% (-1.34% 🔻)	64.77% (-2.25% 🔻)	90% (-1.67% 🔻)	77.17% (-1.19% 🔻)
🟡	... / exchange.ts	75.44% (-7.89% 🔻)	77.78%	80% (-10% 🔻)	75% (-8.05% 🔻)
🟢	... / session.ts	82.86% (-0.48% 🔻)	83.87%	71.43%	81.82% (-0.53% 🔻)

Test suite run success

1890 tests passing in 857 suites.

Report generated by 🧪jest coverage report action from 0022560

[lihaokx]

LGTM

[lihaokx]

LGTM

We may also need the gating on the BED. Since if devs using earlier version cli, the error message is not shown.

[jrrafols]

LGTM in general. Left one comment around wording, but code looks good otherwise. Also, you may want to get someone from the CLI team to 👀 this PR as well just to make sure they're aligned with the change.
🎩 ✅

[jrrafols]

Hey @jrrafols you have created CLI-related PRs before. Do you know someone from the CLI team that I can assign to review this? thanks

I think @Shopify/app-ui might be the team to ping on this? You can also drop into #help-cli and ask for a review there.

[alfonso-noriega]

@brianshen1990, the CLI is trying to move away as much as possible from extension specific logic like this (correct me if wrong @isaacroldan ). And, as mentioned by @lihaokx, having the validation in the CLI only applies to developers running the release with this changes.
IMO this validation should live in the BE, specifically in the group definition. The requires property allows to define a list of targets valid to be deployed with the current one and it can be easily extended to define a list of targets which it can not coexist.
FYI @vividviolet