Python: Docs: Add Microsoft Agent Framework successor callout to READMEs #10546

Job	Run time
Python Unit Tests (3.11, ubuntu-latest, false, dapr)	27s
Python Unit Tests (3.12, ubuntu-latest, false, dapr)	26s
Python Unit Tests (3.10, windows-latest, false, dapr)	1m 32s
Python Unit Tests (3.11, windows-latest, false, unit-all-except-dapr)	4m 4s
Python Unit Tests (3.11, windows-latest, false, dapr)	56s
Python Unit Tests (3.10, ubuntu-latest, false, dapr)	29s
Python Unit Tests (3.10, ubuntu-latest, false, unit-all-except-dapr)	2m 28s
Python Unit Tests (3.12, ubuntu-latest, false, unit-all-except-dapr)	2m 31s
Python Unit Tests (3.10, windows-latest, false, unit-all-except-dapr)	2m 56s
Python Unit Tests (3.11, ubuntu-latest, false, unit-all-except-dapr)	2m 31s
Python Unit Tests (3.12, windows-latest, false, dapr)	1m 5s
Python Unit Tests (3.12, macos-latest, false, dapr)	51s
Python Unit Tests (3.12, windows-latest, false, unit-all-except-dapr)	4m 26s
Python Unit Tests (3.12, macos-latest, false, unit-all-except-dapr)	2m 53s
Python Unit Tests (3.13, ubuntu-latest, true, unit-all-except-dapr)	2m 35s
	30m 10s

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