Rename FunctionCallContent.InvocationRequired to InformationalOnly with inverted polarity

[Copilot]

Renames FunctionCallContent.InvocationRequired to InformationalOnly and inverts the polarity. The property now defaults to false (was true), meaning function calls require processing unless explicitly marked as informational.

Changes

• FunctionCallContent.cs: Renamed property, inverted default value, updated documentation
• FunctionInvokingChatClient.cs: Updated all 4 usages with proper polarity inversion
• Tests: Updated test names and assertions in FunctionCallContentTests, FunctionInvokingChatClientTests, and FunctionInvokingChatClientApprovalsTests
• API manifest & CHANGELOG: Updated accordingly

Migration

// Before
fcc.InvocationRequired           // check if invocation needed
fcc.InvocationRequired = false   // mark as already processed

// After  
!fcc.InformationalOnly           // check if invocation needed
fcc.InformationalOnly = true     // mark as already processed

Original prompt

FunctionCallContent.InvocationRequired should have its polarity inverted and it should be renamed to InformationalOnly. That means for example that code like fcc.InvocationRequired should become !fcc.InformationalOnly and code like fcc.InvocationRequired = false should become fcc.InformationalOnly = true.

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[Copilot]

Pull request overview

This PR renames the FunctionCallContent.InvocationRequired property to InformationalOnly and inverts its polarity. The property now defaults to false (was true), meaning function calls require processing unless explicitly marked as informational-only. This is a breaking API change that improves clarity by using positive semantics (what something is) rather than negative semantics (what something requires).

Changes:

• Renamed InvocationRequired to InformationalOnly with inverted default value (false instead of true)
• Updated all 6 usages in FunctionInvokingChatClient.cs with proper polarity inversion
• Updated test names, assertions, and comments across 3 test files to reflect the new property name and semantics

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
src/Libraries/Microsoft.Extensions.AI.Abstractions/Contents/FunctionCallContent.cs	Renamed property from InvocationRequired to InformationalOnly, changed default from true to false, and updated XML documentation
src/Libraries/Microsoft.Extensions.AI/ChatCompletion/FunctionInvokingChatClient.cs	Updated 4 boolean checks to use !InformationalOnly instead of InvocationRequired, and 2 assignments to set InformationalOnly = true instead of InvocationRequired = false
test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/Contents/FunctionCallContentTests.cs	Updated 5 test method names and all assertions to use InformationalOnly with correct polarity
test/Libraries/Microsoft.Extensions.AI.Tests/ChatCompletion/FunctionInvokingChatClientTests.cs	Updated 4 test method names, all assertions, comments, and test data creation to use InformationalOnly with inverted polarity
test/Libraries/Microsoft.Extensions.AI.Tests/ChatCompletion/FunctionInvokingChatClientApprovalsTests.cs	Updated 1 test method name and assertions to use InformationalOnly with correct polarity
src/Libraries/Microsoft.Extensions.AI.Abstractions/Microsoft.Extensions.AI.Abstractions.json	Updated API manifest to reflect the property rename
src/Libraries/Microsoft.Extensions.AI.Abstractions/CHANGELOG.md	Updated changelog entry to describe the new property