(DOCSP-39147): Update SPM install instructions and privacy manifest details

[dacharyc]

Pull Request Info

Jira ticket: https://jira.mongodb.org/browse/DOCSP-39147

• Install: Update the Swift Package Manager and Privacy Manifest sections with information about building as a dynamic framework and linking only to one package.
• Test and Debug: Add info for the error related to linking to both Realm and RealmSwift.

Reminder Checklist

Before merging your PR, make sure to check a few things.

• [x] Did you tag pages appropriately?
  • genre
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• [x] Describe your PR's changes in the Release Notes section
• [x] Create a Jira ticket for related docs-app-services work, if any

Release Notes

• Swift SDK
  • Install: Update the Swift Package Manager and Privacy Manifest sections with information about building as a dynamic framework and linking only to one package.
  • Test and Debug: Add information about how to resolve an error related to linking to both Realm and RealmSwift.

Review Guidelines

REVIEWING.md

[github-actions[bot]]

Readability for Commit Hash: 65ba6b0e7c9ea8786d331d0b6f0f9468ee9bd864

You can see any previous Readability scores (if they exist) by looking at the comment's history.

Readability scores for changed documents:

• source/sdk/swift/install: Grade Level: 6.2, Reading Ease: 69.28
• source/sdk/swift/test-and-debug: Grade Level: 7.4, Reading Ease: 66.13

For Grade Level, aim for 8 or below.

For Reading Ease scores, aim for 60 or above:

Score	Difficulty
90-100	Very Easy
80-89	Easy
70-79	Fairly Easy
60-69	Medium
50-59	Fairly Hard
30-49	Hard
0-29	Very Hard

For help improving readability, try Hemingway App.

[docs-builder-bot]

✨ Staging URL: https://preview-mongodbmongodb.gatsbyjs.io/realm/master/

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• job log: e7bba7729d6f70ecf93ca725967b8c24932e36b8