Subscribe Block: Fix double border on "Set up a paid plan" toolbar button

[ntsekouras]

Fixes: #41701

The "Set up a paid plan" button has a double border.

This PR fixes the issue by removing the extra Toolbar (BlockContols already render a Toolbar).

Since I took a quick look at the code it seems that GetAddPaidPlanButton is not used anywhere else and that means the context prop too, so I moved the component in the edit file and also removed the withSelect in favor of useSelect.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
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Does this pull request change what data or activity we track or use?

No

Testing instructions:

1. Insert a Subscribe block and observe that the toolbar button is rendered properly without double borders.
2. Everything should work as before

Before	After

[github-actions]

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[github-actions]

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[github-actions]

Code Coverage Summary

Coverage changed in 3 files.

File	Coverage	Δ%	Δ Uncovered
projects/plugins/jetpack/extensions/blocks/subscriptions/edit.js	47/54 (87.04%)	3.70%	-2 💚
projects/plugins/jetpack/extensions/store/membership-products/resolvers.js	69/106 (65.09%)	3.77%	-4 💚
projects/plugins/jetpack/extensions/shared/memberships/utils.js	6/9 (66.67%)	26.67%	-6 💚

Full summary · PHP report · JS report