maint(common): rename and move node-related script functions into node.inc.sh

[Markus-SWAG]

Consolidates the node-related script functions into node.inc.sh, as part
of cleaning up the build scripts and making them easier to maintain into
the future.

Follows: #14540

Build-bot: skip
Test-bot: skip

[keymanapp-test-bot]

User Test Results

Test specification and instructions

User tests are not required

Test Artifacts

• Android

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• iOS

  • TestFlight internal PR build version - 19.0.103 (0.14568.14294)

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[mcdurdin]

LGTM

The title should indicate that this is to do with docker only, e.g. maint(resources): source node.inc.sh instead of utils.inc.sh in docker-build.inc.sh

[mcdurdin]

Two process notes:

• I edited the body of the PR to remove the indent, which had caused it to be treated as a code block and meant the the Test Bot and Build Bot did not see their instructions (similarly with commit messages, don't indent them, as the commit trailers should not have whitespace)

• as this PR doesn't actually fix maint(common): move node-related functions out of utils.inc.sh #14447, but just fixes one specific script impacted by maint(common): rename and move node-related script functions into node.inc.sh #14540, don't include Fixes: #14447 in the commit message or the PR body.

[ermshiperete]

LGTM

The PR and commit titles don't really match what's done in the change though... For example could be something like:

maint(common): adjust to new location of node-related script functions

PR #14451 moved the node-related script functions to `node.inc.sh`. This change
updates the docker-build include to use this new file.

Follows: #14451 
Follows: #14540
Build-bot: skip
Test-bot: skip

It's helpful if the PR and commit titles match the code change since that helps when looking at the git history.

[keyman-server]

Changes in this pull request will be available for download in Keyman version 19.0.104-alpha