Prepare 0.88.0 release (#2297) #136

Job	Run time
End-to-end tests (1.23, e2e)	15m 12s
End-to-end tests (1.23, e2e-instrumentation)	18m 37s
End-to-end tests (1.23, e2e-upgrade)	11m 9s
End-to-end tests (1.23, e2e-prometheuscr)	15m 4s
End-to-end tests (1.23, e2e-autoscale)	15m 11s
End-to-end tests (1.23, e2e-multi-instrumentation)	14m 14s
End-to-end tests (1.23, e2e-pdb)	17m 13s
End-to-end tests (1.23, e2e-opampbridge)	15m 15s
End-to-end tests (1.28, e2e)	19m 18s
End-to-end tests (1.28, e2e-instrumentation)	15m 14s
End-to-end tests (1.28, e2e-upgrade)	14m 32s
End-to-end tests (1.28, e2e-prometheuscr)	14m 55s
End-to-end tests (1.28, e2e-autoscale)	13m 7s
End-to-end tests (1.28, e2e-multi-instrumentation)	9m 45s
End-to-end tests (1.28, e2e-pdb)	13m 36s
End-to-end tests (1.28, e2e-opampbridge)	14m 21s
e2e-tests-check	2s
	3h 56m 45s

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