Remove Linode APIv3 support #3730

Job	Run time
Build and Verify Docker Image (3.10)	3m 26s
Generate Code Coverage (3.10)	3m 53s
Run Various Lint and Other Checks (3.10)	5m 4s
Build and Test Release Artifact (3.10)	2m 34s
Run Security Checks (3.10)	1m 32s
Micro Benchmarks (3.10)	2m 25s
Build and upload Documentation (3.10)	2m 0s
Unit Tests (Python 3.11)	1m 54s
Unit Tests (Python 3.10)	2m 2s
Unit Tests (Python 3.12)	2m 9s
Unit Tests (Python 3.13)	2m 3s
Unit Tests (Python pypy-3.10)	2m 40s
Unit Tests (Python 3.14)	2m 55s
	34m 37s

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