Fix error generation when status is .internal

[tciuro]

Description

Expectation
When an internal error is received on the client side (iOS), I would expect to contain the following:

code: internal
message: <some string>

Reality
What actually happens is that the message is dropped/rewritten with INTERNAL, so any potential critical information gets destroyed.

Reproducing the issue

From a cloud function throw the following error:

throw new functions.https.HttpsError('internal', 'Something really bad happened!')

On the client, the content of the generated message is:

code: INTERNAL
message: INTERNAL

Firebase SDK Version

10.9.0

Xcode Version

14.3

Installation Method

Swift Package Manager

Firebase Product(s)

Functions

Targeted Platforms

iOS

Relevant Log Output

No response

If using Swift Package Manager, the project's Package.resolved

Expand Package.resolved snippet

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If using CocoaPods, the project's Podfile.lock

Expand Podfile.lock snippet

Replace this line with the contents of your Podfile.lock!

[tciuro]

Proposed fix: #11311