Annotate System.Diagnostics.Process.MaxWorkingSet/MinWorkingSet props as unsupported on iOS/tvOS

[MaximLipnin]

Part of #47910

System.Diagnostics.Process.MaxWorkingSet/MinWorkingSet properties throw PNSE on iOS/tvOS.
As an example, the test failure below:

      <test name="System.Diagnostics.Tests.ProcessTests.MaxWorkingSet_GetNotStarted_ThrowsInvalidOperationException" type="System.Diagnostics.Tests.ProcessTests" method="MaxWorkingSet_GetNotStarted_ThrowsInvalidOperationException" time="0.0027397" result="Fail">
        <failure exception-type="Xunit.Sdk.ThrowsException">
          <message><![CDATA[Assert.Throws() Failure\nExpected: typeof(System.InvalidOperationException)\nActual:   typeof(System.PlatformNotSupportedException): Getting or setting the working set limits on other processes is not supported on this platform.\n---- System.PlatformNotSupportedException : Getting or setting the working set limits on other processes is not supported on this platform.]]></message>
          <stack-trace><![CDATA[   at System.Diagnostics.Process.GetWorkingSetLimits(IntPtr& minWorkingSet, IntPtr& maxWorkingSet) in System.Diagnostics.Process.dll:token 0x600011f+0x12
   at System.Diagnostics.Process.EnsureWorkingSetLimits() in System.Diagnostics.Process.dll:token 0x60000cf+0x8
   at System.Diagnostics.Process.get_MaxWorkingSet() in System.Diagnostics.Process.dll:token 0x600009b+0x0
   at System.Diagnostics.Tests.ProcessTests.<>c__DisplayClass30_0.<MaxWorkingSet_GetNotStarted_ThrowsInvalidOperationException>b__0() in System.Diagnostics.Process.Tests.dll:token 0x60002f8+0x0
----- Inner Stack Trace -----
   at System.Diagnostics.Process.GetWorkingSetLimits(IntPtr& minWorkingSet, IntPtr& maxWorkingSet) in System.Diagnostics.Process.dll:token 0x600011f+0x12
   at System.Diagnostics.Process.EnsureWorkingSetLimits() in System.Diagnostics.Process.dll:token 0x60000cf+0x8
   at System.Diagnostics.Process.get_MaxWorkingSet() in System.Diagnostics.Process.dll:token 0x600009b+0x0
   at System.Diagnostics.Tests.ProcessTests.<>c__DisplayClass30_0.<MaxWorkingSet_GetNotStarted_ThrowsInvalidOperationException>b__0() in System.Diagnostics.Process.Tests.dll:token 0x60002f8+0x0]]></stack-trace>
        </failure>
      </test>

[dotnet-issue-labeler]

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, to please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

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Issue Details

---

Part of #47910

System.Diagnostics.Process.MaxWorkingSet/MinWorkingSet properties throw PNSE on iOS/tvOS.
As an example, the test failure below:

      <test name="System.Diagnostics.Tests.ProcessTests.MaxWorkingSet_GetNotStarted_ThrowsInvalidOperationException" type="System.Diagnostics.Tests.ProcessTests" method="MaxWorkingSet_GetNotStarted_ThrowsInvalidOperationException" time="0.0027397" result="Fail">
        <failure exception-type="Xunit.Sdk.ThrowsException">
          <message><![CDATA[Assert.Throws() Failure\nExpected: typeof(System.InvalidOperationException)\nActual:   typeof(System.PlatformNotSupportedException): Getting or setting the working set limits on other processes is not supported on this platform.\n---- System.PlatformNotSupportedException : Getting or setting the working set limits on other processes is not supported on this platform.]]></message>
          <stack-trace><![CDATA[   at System.Diagnostics.Process.GetWorkingSetLimits(IntPtr& minWorkingSet, IntPtr& maxWorkingSet) in System.Diagnostics.Process.dll:token 0x600011f+0x12
   at System.Diagnostics.Process.EnsureWorkingSetLimits() in System.Diagnostics.Process.dll:token 0x60000cf+0x8
   at System.Diagnostics.Process.get_MaxWorkingSet() in System.Diagnostics.Process.dll:token 0x600009b+0x0
   at System.Diagnostics.Tests.ProcessTests.<>c__DisplayClass30_0.<MaxWorkingSet_GetNotStarted_ThrowsInvalidOperationException>b__0() in System.Diagnostics.Process.Tests.dll:token 0x60002f8+0x0
----- Inner Stack Trace -----
   at System.Diagnostics.Process.GetWorkingSetLimits(IntPtr& minWorkingSet, IntPtr& maxWorkingSet) in System.Diagnostics.Process.dll:token 0x600011f+0x12
   at System.Diagnostics.Process.EnsureWorkingSetLimits() in System.Diagnostics.Process.dll:token 0x60000cf+0x8
   at System.Diagnostics.Process.get_MaxWorkingSet() in System.Diagnostics.Process.dll:token 0x600009b+0x0
   at System.Diagnostics.Tests.ProcessTests.<>c__DisplayClass30_0.<MaxWorkingSet_GetNotStarted_ThrowsInvalidOperationException>b__0() in System.Diagnostics.Process.Tests.dll:token 0x60002f8+0x0]]></stack-trace>
        </failure>
      </test>

Author:	MaximLipnin
Assignees:	-
Labels:	area-System.Diagnostics.Process, new-api-needs-documentation
Milestone:	-