Remove a few array allocations from enumeration

[stephentoub]

No description provided.

[Copilot]

Pull Request Overview

This pull request optimizes memory allocation by replacing array allocations with ReadOnlySpan<T> for iteration scenarios, reducing garbage collection pressure in various .NET libraries.

Key Changes:

• Replace new T[] array allocations with ReadOnlySpan<T> collection expressions using [...] syntax
• Optimize string splitting operations to use span-based methods instead of creating intermediate arrays
• Remove unnecessary braces in some code blocks

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
RegistryDataKey.cs	Replace registry key array with ReadOnlySpan for enumeration
CertificateHelpers.Windows.cs	Convert provider type arrays to ReadOnlySpan and clean up braces
TimeZoneInfo.Unix.Android.cs	Replace timezone file directory array with ReadOnlySpan
LinuxIPv4InterfaceProperties.cs	Convert file path array to ReadOnlySpan for iteration
ADStoreCtx_LoadStore.cs	Replace URN scheme array with ReadOnlySpan
Process.Linux.cs	Convert allowed programs array to ReadOnlySpan
EnumConverter.cs	Replace string.Split() with span-based splitting to avoid array allocation

Comments suppressed due to low confidence (2)

src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/X509Certificates/CertificateHelpers.Windows.cs:122

• Extra opening brace. The using statement already provides the scope, so this additional brace is unnecessary.

                    {

src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/X509Certificates/CertificateHelpers.Windows.cs:155

• Extra opening brace. The using statement already provides the scope, so this additional brace is unnecessary.

                    {

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