THRIFT-5783 drop net7 support #1624

Job	Run time
compiler (ubuntu-20.04)	2m 33s
compiler (ubuntu-22.04)	1m 58s
lib-java-kotlin	4m 14s
lib-go (1.21)	1m 47s
lib-php (7.1)	1m 8s
lib-swift	1m 20s
lib-go (1.22)	1m 42s
lib-php (7.2)	1m 13s
lib-python (3.x)	1m 18s
lib-php (7.3)	1m 10s
lib-rust	3m 12s
lib-php (7.4)	58s
lib-php (8)	1m 9s
lib-php (8.1)	58s
lib-php (8.2)	1m 10s
lib-php (8.3)	1m 5s
cross-test (java, java,kotlin)	1m 55s
cross-test (java, go,rs)	1m 15s
cross-test (java, swift)	31s
cross-test (kotlin, java,kotlin)	44s
cross-test (kotlin, go,rs)	29s
cross-test (kotlin, swift)	44s
cross-test (go, java,kotlin)	39s
cross-test (go, go,rs)	37s
cross-test (go, swift)	25s
cross-test (rs, java,kotlin)	32s
cross-test (rs, go,rs)	1m 10s
cross-test (rs, swift)	49s
cross-test (swift, java,kotlin)	47s
cross-test (swift, go,rs)	56s
cross-test (swift, swift)	33s
	39m 1s

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