Fix: replace `uctl` with `flytectl` in OSS docs #3807

Job	Run time
unpack-envvars	1s
flyteadmin integration tests image / build_docker	2m 40s
Build Images / Build & Push Image (datacatalog) / Push to Github Registry	4m 3s
Build Images / Build & Push Image (flyteadmin) / Push to Github Registry	29s
Build Images / Build & Push Image (flytecopilot) / Push to Github Registry	3m 59s
Build Images / Build & Push Image (flytepropeller) / Push to Github Registry	5m 57s
Build Images / Build & Push Image (flytescheduler) / Push to Github Registry	5m 22s
Dry Run Goreleaser	7m 48s
Test Getting started	4m 28s
Lint (flyteadmin) / Run Lint	2m 57s
Lint (datacatalog) / Run Lint	2m 10s
Lint (flytectl) / Run Lint	2m 25s
Lint (flyteidl) / Run Lint	1m 48s
Lint (flyteplugins) / Run Lint	2m 54s
Lint (flytepropeller) / Run Lint	2m 59s
Check Go Generate (datacatalog) / Go Generate	1m 21s
Check Go Generate (flyteadmin) / Go Generate	2m 2s
Lint (flytestdlib) / Run Lint	2m 26s
Unit Tests (datacatalog) / Run Unit Test	2m 55s
Unit Tests (flyteadmin) / Run Unit Test	4m 13s
Unit Tests (flytecopilot) / Run Unit Test	2m 24s
Unit Tests (flytectl) / Run Unit Test	3m 29s
Unit Tests (flyteplugins) / Run Unit Test	3m 40s
Unit Tests (flytepropeller) / Run Unit Test	4m 8s
Unit Tests (flytestdlib) / Run Unit Test	3m 36s
Check Go Generate (flytectl) / Go Generate	1m 58s
Check Go Generate (flytecopilot) / Go Generate	1m 14s
Check Go Generate (flytepropeller) / Go Generate	1m 50s
Integration Test (flyteadmin) / Integration tests	6m 1s
	1h 31m 17s

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