(DOCSP-34757): C++: Remove Preview naming

[dacharyc]

Pull Request Info

Jira ticket: https://jira.mongodb.org/browse/DOCSP-34757

• Staged Changes: Remove "Preview" and "preview" everywhere EXCEPT as already removed in (DOCSP-34756): C++: Update code examples for GA #3113 and (DOCSP-34763): C++: Remove version directives #3130 . There are a couple of places in page copy where I did not remove preview naming because I already did that in the PR that removes the experimental namespace. And there are places in version directives that use the preview naming, but I already deleted those references in the PR that removed the version directives.

Review Guidelines

REVIEWING.md

[github-actions]

Readability for Commit Hash: 9ad104b

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

Readability scores for changed documents:

• source/sdk/cpp: Grade Level: 10.2, Reading Ease: 42.78
• source/sdk/cpp/application-services: Grade Level: 8.5, Reading Ease: 57.98
• source/sdk/cpp/realm-files: Grade Level: 5.1, Reading Ease: 66.7
• source/sdk/cpp/telemetry: Grade Level: 0.9, Reading Ease: 93.81
• source/sdk/cpp/install: Grade Level: 7.3, Reading Ease: 61.12
• source/sdk/cpp/quick-start: Grade Level: 8.7, Reading Ease: 57.47
• source/sdk/cpp/manage-users: Grade Level: 8.3, Reading Ease: 58.38
• source/sdk/cpp/logging: Grade Level: 7.7, Reading Ease: 65.42
• source/sdk/cpp/react-to-changes: Grade Level: 11.1, Reading Ease: 40.35
• source/sdk/cpp/sync: Grade Level: 9.9, Reading Ease: 48.81
• source/sdk/cpp/sync/log-level: Grade Level: 7.4, Reading Ease: 66.13
• source/sdk/cpp/sync/sync-subscriptions: Grade Level: 7.1, Reading Ease: 66.84
• source/sdk/cpp/sync/write-to-synced-realm: Grade Level: 10.0, Reading Ease: 53.92
• source/sdk/cpp/sync/handle-sync-errors: Grade Level: 7.7, Reading Ease: 54.59
• source/sdk/cpp/sync/stream-data-to-atlas: Grade Level: 10.6, Reading Ease: 46.98
• source/sdk/cpp/sync/manage-sync-session: Grade Level: 6.2, Reading Ease: 69.28
• source/sdk/cpp/users/authenticate-users: Grade Level: 8.0, Reading Ease: 59.09
• source/sdk/cpp/users/custom-user-data: Grade Level: 10.6, Reading Ease: 52.39
• source/sdk/cpp/app-services/connect-to-app: Grade Level: 6.4, Reading Ease: 68.87
• source/sdk/cpp/app-services/call-a-function: Grade Level: 9.1, Reading Ease: 61.67
• source/sdk/cpp/model-data/object-models: Grade Level: 8.9, Reading Ease: 56.96
• source/sdk/cpp/model-data/relationships: Grade Level: 9.4, Reading Ease: 50.23
• source/sdk/cpp/model-data/supported-types: Grade Level: 9.9, Reading Ease: 48.91
• source/sdk/cpp/crud/update: Grade Level: 11.7, Reading Ease: 33.41
• source/sdk/cpp/crud/filter-data: Grade Level: 8.8, Reading Ease: 57.06
• source/sdk/cpp/crud/read: Grade Level: 8.8, Reading Ease: 57.06
• source/sdk/cpp/crud/delete: Grade Level: 6.6, Reading Ease: 62.75
• source/sdk/cpp/crud/create: Grade Level: 8.2, Reading Ease: 58.69
• source/sdk/cpp/crud/threading: Grade Level: 7.8, Reading Ease: 65.12
• source/sdk/cpp/realm-files/encrypt-a-realm: Grade Level: 8.0, Reading Ease: 64.61
• source/sdk/cpp/realm-files/configure-and-open-a-realm: Grade Level: 7.6, Reading Ease: 65.73

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

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