docs(nx-cloud): update start-ci-run docs with --force flag and cleanup command

[lourw]

Current Behavior

Updates docs to include nx-cloud cleanup command as an alternative to resetting your system after running nx-cloud start-ci-run.

Also provides more context about nx-cloud start-ci-run's check for local environments and how to bypass this check with the --force flag.

Expected Behavior

Related Issue(s)

Fixes #

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Name	Status	Preview	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	May 3, 2024 3:20pm

[nx-cloud]

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✅ Successfully ran 6 targets

• nx affected --targets=e2e,e2e-ci --base=e06b787e6317b4839fef7738695f5c7e6e725c30 --head=3a1855c6b7a2fa0bb98e72fd223beb457ff83621 --parallel=1
• nx affected --targets=lint,test,build --base=e06b787e6317b4839fef7738695f5c7e6e725c30 --head=3a1855c6b7a2fa0bb98e72fd223beb457ff83621 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=e06b787e6317b4839fef7738695f5c7e6e725c30 --head=3a1855c6b7a2fa0bb98e72fd223beb457ff83621
• nx documentation --no-dte
• nx affected -t e2e-macos-ci --parallel=1 --base=e06b787e6317b4839fef7738695f5c7e6e725c30 --head=3a1855c6b7a2fa0bb98e72fd223beb457ff83621

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