improve: save config settings in sample app cache (SDKCF-6887)

[maureenorea-clores]

Description

For testing app relaunches with runtime configuration (sample app update only)

Links

N/A

Checklist

• I have read the contributing guidelines.
• 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 checked that all possible internal and platform/library exceptions are gracefully handled and will not crash the host app
• I checked for open & known issues (especially crashes) for any newly added platform APIs or libraries
• I tested non-trivial changes on a real device
• I added ticket/changes in changelog
• I ran ./gradlew check without errors

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[rakutentech-danger-bot]

	2 Warnings
⚠️	Tests were not updated.
⚠️	PR title "improve: save config settings in sample app cache" should append ticket number(s).

JaCoCo Code Coverage 97.6% ✅

Class	Covered	Meta	Status

Generated by 🚫 Danger

[mdusmangani-jp]

LGTM