[3/4] chore(samples): Remove CocoaPods sample and podspec tooling, making SPM the sole Apple sample path

[buenaflor]

Phase 3 of the stacked spm4Kmp migration (stacked on #557). Now that the SDK's internal Apple build no longer uses the Kotlin CocoaPods plugin, this PR removes the dead CocoaPods sample and internal build tooling and makes the SPM sample the sole Apple sample validation path.

Why: keeping the CocoaPods sample and SDK podspec around after the spm4Kmp switch is pure dead weight — the SDK module no longer applies the native.cocoapods plugin, so generateDummyFramework/syncFramework and sentry_kotlin_multiplatform.podspec are unused. Consolidating on the SPM sample keeps a single, representative consumer build in CI.

What changed:

• Makefile buildAppleSamples now xcodebuilds the SPM sample (kmp-app-spm/iosApp.xcodeproj, scheme iosApp, Debug/iphonesimulator/arm64) and drops podInstall/pod update. kotlin-multiplatform.yml inherits this via make buildAppleSamples; test-samples is unaffected.
• Removed the kmp-app-cocoapods sample entirely (its settings.gradle.kts includes and .run/*-cocoapods.run.xml), and repointed kmp-app-spm:desktopApp to the SPM shared module (it had a stray dependency on the cocoapods shared module).
• Deleted the SDK sentry_kotlin_multiplatform.podspec and the unused native.cocoapods plugin classpath entry (root build.gradle.kts + Config.cocoapods).
• Rewrote scripts/update-cocoa.sh to bump Config.kt, the plugin gradle.properties, and the SPM sample's SwiftPM pin in project.pbxproj, then refresh Package.resolved via xcodebuild -resolvePackageDependencies (dropped the podspec/generateDummyFramework/pod update steps).
• Pointed scripts/bump-version.sh at Config.kt for the Cocoa compatibility-table version (podspec is gone) and narrowed the sample prepare scripts to kmp-app-spm.

Consumer-facing Gradle plugin CocoaPods support (installSentryForCocoapods, CocoapodsAutoInstallExtension, CocoaFrameworkLinker) is intentionally untouched.

Verification: SPM sample iOS xcodebuild BUILD SUCCEEDED (Xcode 26.1.1), ./gradlew build -p sentry-samples, and spotlessApply/detekt/apiCheck all green; update-cocoa.sh get-version resolves correctly.

Note: the watchosArm32 re-enable is still tracked in the earlier stack PR and is out of scope here.

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