[build-presets] Disabled SourceKit-LSP tests for all SwiftPM Linux jobs

Disable SourceKit-LSP testing for everything that uses `mixin_swiftpm_linux_platform` instead of `mixin_swiftpm_package_linux_platform`.

Author: ahoppen

utils/build-presets.ini

@@ -1686,6 +1686,9 @@ skip-test-foundation
 skip-test-libdispatch
 skip-test-xctest
 
+# SourceKit-LSP tests are flaky on Linux, disable them until we have fixed the root cause - rdar://90437872
+skip-test-sourcekit-lsp
+
 # Builds enough of the the toolchain to build a swift pacakge on macOS.
 [preset: mixin_swiftpm_package_macos_platform]
 mixin-preset=mixin_swiftpm_macos_platform
@@ -1707,8 +1710,6 @@ mixin-preset=mixin_swiftpm_linux_platform
 
 skip-test-llbuild
 skip-test-swiftpm
-# SourceKit-LSP tests are flaky on Linux, disable them until we have fixed the root cause - rdar://90437872
-skip-test-sourcekit-lsp
 
 
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