test

ci: run tests for legacy versions #791

Job	Run time
Python 2.7 (legacy) on Linux	1m 42s
Python 3.4 (legacy) on Linux	39s
Lint datadogpy files on Python 3.8	20s
Python 3.9 on Linux	2m 7s
Python 3.8 on Linux	2m 1s
Python pypy3.8 on Linux	2m 30s
Python 3.12 on Linux	1m 53s
Python 3.10 on Linux	2m 2s
Python pypy2.7 on Linux	2m 31s
Python 3.13 on Linux	2m 1s
Python 3.14 on Linux	2m 2s
Python 3.7 on Linux	2m 3s
Python 3.11 on Linux	1m 54s
	23m 45s

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