[release/8.0-rc1] [mono][ios] Revert LLVM mode for apple mobile tests

[github-actions]

PR: #90586

Description

Backport of #90586 to release/8.0-rc1

This PR reverts the default setting of using Mono AOT LLVM compilation for Apple mobile tests. The regression was introduced in #87773 which refactored a CI pipeline. The expected behavior was to AOT compile runtime and functional tests using Mono AOT LLVM runtime, but instead, Mono AOT mini runtime is used.

The fix for this issue includes passing MonoEnableLLVM property.

Customer Impact

The issue was discovered by a team member.

Testing

Manual testing and an automated testing on the CI were performed, ensuring that the Mono AOT LLVM runtime is used. The issue has been reproduced locally, and has been fixed.

Risk

Low risk. This change involves passing an additional parameter when executing runtime and functional tests on Apple mobile platforms.

IMPORTANT: If this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.

The change doesn't affect code that ships in a NuGet package.

[ghost]

Tagging subscribers to 'os-ios': @steveisok, @akoeplinger, @kotlarmilos
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Backport of #90586 to release/8.0-rc1

/cc @kotlarmilos

Customer Impact

Testing

Risk

IMPORTANT: If this backport is for a servicing release, please verify that:

• The PR target branch is release/X.0-staging, not release/X.0.

• If the change touches code that ships in a NuGet package, you have added the necessary package authoring and gotten it explicitly reviewed.

Author:	github-actions[bot]
Assignees:	kotlarmilos
Labels:	Servicing-consider, area-Infrastructure-mono, os-ios
Milestone:	-

[ghost]

Tagging subscribers to this area: @directhex
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Backport of #90586 to release/8.0-rc1

/cc @kotlarmilos

Customer Impact

Testing

Risk

IMPORTANT: If this backport is for a servicing release, please verify that:

• The PR target branch is release/X.0-staging, not release/X.0.

• If the change touches code that ships in a NuGet package, you have added the necessary package authoring and gotten it explicitly reviewed.

Author:	github-actions[bot]
Assignees:	kotlarmilos
Labels:	Servicing-consider, area-Infrastructure-mono
Milestone:	-

[steveisok]

@carlossanlop this is an infra change that impacts the test build.