Fetch offline entitlement mappings through Remote Config

[rickvdl]

(Don't merge before backend is ready)

iOS equivalent of Android PR RevenueCat/purchases-android#3817

Description

Implements fetching the ProductEntitlementMapping through the remote config infrastructure. This will only be done when remote config is enabled. And will still fall back to the existing implementation when remote config is disabled through the kill-switch.

There's still an open question around handling the fallback if the kill-switch is activated later here

[rickvdl]

@RCGitBot please test

[emerge-tools]

2 builds increased size, 2 builds decreased size

Name	Version	Download	Change	Install	Change	Approval
RevenueCat com.revenuecat.PaywallsTester	1.0 (1)	19.3 MB	⬆️ 4.9 kB (0.03%)	69.8 MB	⬆️ 22.6 kB (0.03%)	N/A
BinarySizeTest com.revenuecat.binary-size-test.local-source	1.0 (1)	4.5 MB	⬇️ 1.1 kB (-0.02%)	13.5 MB	⬇️ 4.5 kB (-0.03%)	N/A
BinarySizeTest com.revenuecat.binary-size-test.cocoapods	1.0 (1)	6.8 MB	⬇️ 128 B	29.6 MB	⬆️ 3.5 kB (0.01%)	N/A
BinarySizeTest com.revenuecat.binary-size-test.spm	1.0 (1)	4.6 MB	⬇️ 6.0 kB (-0.13%)	11.7 MB	⬇️ 4.4 kB (-0.04%)	N/A

RevenueCat 1.0 (1)
com.revenuecat.PaywallsTester

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⏱️ Analyze build performance

Total install size change: ⬆️ 22.6 kB (0.03%)
Total download size change: ⬆️ 4.9 kB (0.03%)

Largest size changes

Item	Install Size Change
DYLD.String Table	⬆️ 16.7 kB
DYLD.Exports	⬆️ 1.4 kB
RevenueCat.OfflineEntitlementsManager.OfflineEntitlementsManager	⬇️ -928 B
Other	⬆️ 5.4 kB

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BinarySizeTest 1.0 (1)
com.revenuecat.binary-size-test.local-source

⚖️ Compare build
📦 Install build
⏱️ Analyze build performance

Total install size change: ⬇️ 4.5 kB (-0.03%)
Total download size change: ⬇️ 1.1 kB (-0.02%)

Largest size changes

Item	Install Size Change
🗑 RevenueCat.OfflineEntitlementsManager.Error	⬇️ -10.4 kB
📝 RevenueCat.OfflineEntitlementsManager.updateProductsEntitlementsC...	⬆️ 1.6 kB
RevenueCat.Purchases.updateAllCaches(isAppBackgrounded,fetchConte...	⬇️ -1.6 kB
Swift._NativeDictionary.merge(isUnique,uniquingKeysWith)	⬇️ -1.0 kB
objectdestroyTm	⬇️ -632 B

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BinarySizeTest 1.0 (1)
com.revenuecat.binary-size-test.cocoapods

⚖️ Compare build
📦 Install build
⏱️ Analyze build performance

Total install size change: ⬆️ 3.5 kB (0.01%)
Total download size change: ⬇️ 128 B

Largest size changes

Item	Install Size Change
🗑 RevenueCat.OfflineEntitlementsManager.Error	⬇️ -10.4 kB
DYLD.String Table	⬆️ 4.8 kB
📝 RevenueCat.OfflineEntitlementsManager.updateProductsEntitlementsC...	⬆️ 1.6 kB
RevenueCat.Purchases.updateAllCaches(isAppBackgrounded,fetchConte...	⬇️ -1.6 kB
objectdestroyTm	⬇️ -632 B

View Treemap

BinarySizeTest 1.0 (1)
com.revenuecat.binary-size-test.spm

⚖️ Compare build
📦 Install build
⏱️ Analyze build performance

Total install size change: ⬇️ 4.4 kB (-0.04%)
Total download size change: ⬇️ 6.0 kB (-0.13%)

Largest size changes

Item	Install Size Change
🗑 RevenueCat.OfflineEntitlementsManager.Error	⬇️ -10.4 kB
📝 RevenueCat.OfflineEntitlementsManager.updateProductsEntitlementsC...	⬆️ 1.6 kB
RevenueCat.Purchases.updateAllCaches(isAppBackgrounded,fetchConte...	⬇️ -1.6 kB
Swift._NativeDictionary.merge(isUnique,uniquingKeysWith)	⬇️ -1.0 kB
objectdestroyTm	⬇️ -632 B

View Treemap

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[RevenueCat-Danger-Bot]

❌ CI Job Failed — run-test-ios-26

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Failed Tests

• OfflineEntitlementsManagerAvailableTests/testUpdateProductEntitlementMappingCacheDoesNotUpdateIfStaleFailure()