Plans Spotlight: Align action button with a flexbox

[ddc22]

• Fixes Visual glitch with the /plans grid for users on Business with small screens #97567
• Fixes Plans 2023: Manage add-ons button in the spotlight card isn't vertically centered #86607

Proposed Changes

• Move spotlight plan button to flex container instead of using absolute placement

Why are these changes being made?

• Bug reports raised above and better display of elements

Testing Instructions

• Go to the plans page and make sure the spotlight plan works well on Free plan and Business plan in resolutions

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • For UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

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[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~24 bytes added 📈 [gzipped])

name                  parsed_size           gzip_size
update-design-flow          +91 B  (+0.0%)      +24 B  (+0.0%)
plugins                     +91 B  (+0.0%)      +24 B  (+0.0%)
plans                       +91 B  (+0.0%)      +24 B  (+0.0%)
link-in-bio-tld-flow        +91 B  (+0.0%)      +24 B  (+0.0%)
jetpack-app                 +91 B  (+0.0%)      +24 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Async-loaded Components (~24 bytes added 📈 [gzipped])

name                                             parsed_size           gzip_size
async-load-signup-steps-plans-theme-preselected        +91 B  (+0.0%)      +24 B  (+0.0%)
async-load-signup-steps-plans                          +91 B  (+0.0%)      +24 B  (+0.0%)

React components that are loaded lazily, when a certain part of UI is displayed for the first time.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• blaze-dashboard
• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug fix/center-plan-button on your sandbox.