fix(core): deprecate mf utils from devkit public api

[Coly010]

Current Behavior

MF utils are exposed via the @nx/devkit public api.

Expected Behavior

They should not be exposed, but deprecate first for safety.

Related Issue(s)

Fixes #

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 26, 2023 0:49am

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✅ Successfully ran 8 targets

• nx affected -t e2e-macos --parallel=1 --base= --head=
• nx affected --target=e2e --base=0193967b080305bc4fe092f3eac3a57f7af8edcb --head=287f38df8b7f00a4315b5d766320f64fb0cd5446 --parallel=1
• nx affected --target=test --base=0193967b080305bc4fe092f3eac3a57f7af8edcb --head=287f38df8b7f00a4315b5d766320f64fb0cd5446 --parallel=1
• nx affected --target=build --base=0193967b080305bc4fe092f3eac3a57f7af8edcb --head=287f38df8b7f00a4315b5d766320f64fb0cd5446 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx affected --target=lint --base=0193967b080305bc4fe092f3eac3a57f7af8edcb --head=287f38df8b7f00a4315b5d766320f64fb0cd5446 --parallel=3
• nx-cloud record -- nx format:check --base=0193967b080305bc4fe092f3eac3a57f7af8edcb --head=287f38df8b7f00a4315b5d766320f64fb0cd5446
• nx documentation --no-dte

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[github-actions]

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