DOCSP-38015: Add new collection listener properties

[cbullinger]

Pull Request Info

Jira ticket: https://jira.mongodb.org/browse/DOCSP-38015

• React to Changes - Flutter SDK: Add new isCleared and isCollectionDeleted properties to list, set, and map tabs

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

• Flutter SDK
  • Realm Database/React to Changes: Update "Register Collection Change Listeners" section to document the isCollectionDeleted property for list, set, and map collections and the isCleared property for map collections.

Review Guidelines

REVIEWING.md

[github-actions[bot]]

Readability for Commit Hash: bb4cf876a6e4d1e8d37ce9038323f8e03857517c

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

Readability scores for changed documents:

• source/sdk/flutter/realm-database/react-to-changes: Grade Level: 9.2, Reading Ease: 50.73

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.