[release/v1.51.x] Prepare release 1.51.0 (open-telemetry#7400)

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[release/v1.50.x] Prepare release 1.50.0 (open-telemetry#7339)

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[release/v1.49.x] Prepare release 1.49.0 (open-telemetry#7250)

[release/v1.48.x] Prepare release 1.48.0 (open-telemetry#7187)

[release/v1.47.x] Prepare release 1.47.0 (open-telemetry#7085)

[release/v1.46.x] Prepare release 1.46.0 (open-telemetry#7010)

[release/v1.45.x] Prepare release 1.45.0 (open-telemetry#6928)

[release/v1.44.x] Prepare release 1.44.1 (open-telemetry#6868)

[release/v1.44.x] Prepare release 1.44.0 (open-telemetry#6863)

[release/v1.43.x] Prepare release 1.43.0 (open-telemetry#6783)