chore: enable dark background only for Modal Campaign (RMCCX-7328)

[SoumenRautray]

Description

Added check for enabling dark background only for modal campaign

Links

[RMCCX-7328]

Checklist

• I have read the contributing guidelines
• I have added to the changelog
• I wrote/updated tests for new/changed code
• I removed all sensitive data before every commit, including API endpoints and keys, and internal links
• I ran fastlane ci without errors
• All project file changes are replicated in SampleSPM/SampleSPM.xcodeproj project

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[rakutentech-danger-bot]

	4 Warnings
⚠️	This PR does not have any assignees yet
⚠️	Branch name "RMCCX-7328_modalcheck" should match format: <type>/<ticket-no>_<short-desc> or <type>/<short-desc> or release/<version or desc>
⚠️	Tests were not updated
⚠️	Commit message "chore: enable dark background only for Modal Campaign (RMCCX-7328)" should append ticket number(s) e.g. (SDKCF-1234, SDKCF-1235)

Current coverage for RInAppMessaging.framework is 90.05%

Files changed	-	-
FullView.swift	88.36%	✅

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