Prioritize hardcoded metadata over network-sourced metadata

[hectormmg]

• Fixes a bug where hardcoded metadata for Cloud Instance Discovery was incorrectly built and therefore never worked
• Promotes hardcoded Cloud Instance Discovery metadata over cached and network metadata sources
• Fixes a bug where azure region update method mutates the existing metadata object instead of returning a new object causing MSAL to prepend azure region cumulatively
• Promotes hardcoded Endpoint metadata over cached and network metadata sources

[codecov-commenter]

Codecov Report

Merging #6231 (788daf6) into dev (81d34b4) will decrease coverage by 1.52%.
The diff coverage is 75.57%.

Flag	Coverage Δ
msal-angular	96.73% <96.63%> (+0.22%)	⬆️
msal-browser	86.17% <ø> (-0.30%)	⬇️
msal-common	83.30% <ø> (-1.24%)	⬇️
msal-core	?
msal-node	79.39% <ø> (-4.00%)	⬇️
msal-node-extensions	69.29% <60.12%> (-6.35%)	⬇️
msal-react	94.24% <ø> (-0.45%)	⬇️
node-token-validation	?

Impacted Files	Coverage Δ
...ions/msal-node-extensions/src/utils/Environment.ts	20.51% <0.00%> (-22.08%)	⬇️
...b/msal-browser/src/app/IPublicClientApplication.ts	43.75% <ø> (ø)
...ib/msal-browser/src/app/PublicClientApplication.ts	73.80% <ø> (-21.52%)	⬇️
...er/src/broker/nativeBroker/NativeMessageHandler.ts	86.29% <ø> (+0.33%)	⬆️
lib/msal-browser/src/cache/AsyncMemoryStorage.ts	80.76% <ø> (+2.99%)	⬆️
lib/msal-browser/src/cache/BrowserCacheManager.ts	90.18% <ø> (-1.54%)	⬇️
lib/msal-browser/src/cache/BrowserStorage.ts	87.50% <ø> (-3.41%)	⬇️
lib/msal-browser/src/cache/CryptoKeyStore.ts	80.00% <ø> (-3.34%)	⬇️
lib/msal-browser/src/cache/DatabaseStorage.ts	34.00% <ø> (-4.54%)	⬇️
lib/msal-browser/src/cache/MemoryStorage.ts	100.00% <ø> (ø)
... and 72 more

... and 161 files with indirect coverage changes