Jetpack Social installed via "My Jetpack" panel when Jetpack Complete is applied to site

### Impacted plugin

Jetpack, Social

### Quick summary

If a site has a Jetpack Complete at play, the Jetpack Social plugin is not required.

If you navigate to My Jetpack > if Social product needs activating, with “Activate” button present > Clicking activate installs Jetpack Social.

Discussed here: p1734704224732799-slack-C02JJ910CNL

### Steps to reproduce

1. Connected JP to account
2. Add Jetpack Complete plan via SA
3. In the site, navigate to Dashboard > Jetpack > My Jetpack >
4. If Social product needs activating, with “Activate” button present > Click Activate

Clicking activate installs Jetpack Social plugin

### A clear and concise description of what you expected to happen.

Jetpack Social features should be activated, but should not install plugin.

### What actually happened

Clicking activate installs Jetpack Social plugin

### Impact

Most (> 50%)

### Available workarounds?

There is no user impact

### If the above answer is "Yes...", outline the workaround.

_No response_

### Platform (Simple and/or Atomic)

Atomic

### Logs or notes

_No response_

Start by reproducing the flow through Dashboard > Jetpack > My Jetpack with Jetpack Complete applied, then trace the activation handling for the Social product and Jetpack Social installation. Done means Social features activate without installing the separate Jetpack Social plugin, and the existing activation behavior remains correct for other plans.

Written by the indexing model from the issue text.