chore: Extend app launch handler to macCatalyst and visionOS

[ncreated]

What and why?

QA and merge #1888 by @Hengyu

How?

Using internal branch to merge #1888

• I did small refactoring to avoid code duplication.
• Also changed TARGET_OS_MAC to TARGET_OS_OSX, following this from TargetConditionals.h:

TARGET_OS_MAC                - Generated code will run on a variant of macOS
  TARGET_OS_OSX                - Generated code will run on macOS
  TARGET_OS_IPHONE             - Generated code will run on a variant of iOS (firmware, devices, simulator)
    TARGET_OS_IOS                - Generated code will run on iOS
      TARGET_OS_MACCATALYST        - Generated code will run on macOS
    TARGET_OS_TV                 - Generated code will run on tvOS
    TARGET_OS_WATCH              - Generated code will run on watchOS
    TARGET_OS_VISION             - Generated code will run on visionOS
    TARGET_OS_BRIDGE             - Generated code will run on bridge devices
  TARGET_OS_SIMULATOR          - Generated code will run on an iOS, tvOS, watchOS, or visionOS simulator
  TARGET_OS_DRIVERKIT          - Generated code will run on macOS, iOS, tvOS, watchOS, or visionOS

+--------------------------------------------------------------------------------------+
|                                    TARGET_OS_MAC                                     |
| +-----+ +------------------------------------------------------------+ +-----------+ |
| |     | |                  TARGET_OS_IPHONE                          | |           | |
| |     | | +-----------------+ +----+ +-------+ +--------+ +--------+ | |           | |
| |     | | |       IOS       | |    | |       | |        | |        | | |           | |
| | OSX | | | +-------------+ | | TV | | WATCH | | BRIDGE | | VISION | | | DRIVERKIT | |
| |     | | | | MACCATALYST | | |    | |       | |        | |        | | |           | |
| |     | | | +-------------+ | |    | |       | |        | |        | | |           | |
| |     | | +-----------------+ +----+ +-------+ +--------+ +--------+ | |           | |
| +-----+ +------------------------------------------------------------+ +-----------+ |
+--------------------------------------------------------------------------------------+

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)
• Make sure each commit and the PR mention the Issue number or JIRA reference
• Add CHANGELOG entry for user facing changes

[datadog-datadog-prod-us1]

Datadog Report

Branch report: ncreated/merge-hengyu-enhance-macro-usage-
Commit report: d4df1c5
Test service: dd-sdk-ios

✅ 0 Failed, 1869 Passed, 0 Skipped, 1m 17.36s Total Time
🔻 Test Sessions change in coverage: 2 decreased, 6 no change

🔻 Code Coverage Decreases vs Default Branch (2)

• test DatadogCoreTests iOS 72.68% (-0.07%) - Details
• test DatadogTraceTests iOS 54.32% (-0.02%) - Details

[maxep]

👍

[ncreated]

/merge

[dd-devflow]

🚂 MergeQueue: pull request added to the queue

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Use /merge -c to cancel this operation!

[ncreated]

/remove

[dd-devflow]

🚂 Devflow: /remove

[dd-devflow]

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