test: remove private internal method testing and rewire

Platforms affected

n/a

Motivation and Context

Remove rewire which causes issues in Jasmine testing when files contains #!

The issue will appear when rebuilding package-lock.json or bumping @npmcli/arborist.

Since rewire has not been updated in a long time, it is better to remove.

Description

Removed the unit test file that focused on testing private internal methods. These methods are called and covered by calling the install and uninstall tests.

Only 1.56% is lost from coverage but the single line it covered was only if an argument existed on an array.

This could be easily restored by adding more install tests with the flag. Only downside is increased run time as it calls npm and git directly.

Testing

npm t

With the unit testing of the private inner methods.

21 specs, 0 failures
Finished in 55.745 seconds
----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files |   92.18 |    79.31 |      90 |   93.33 |
 index.js |   92.18 |    79.31 |      90 |   93.33 | 45,128,154,170
----------|---------|----------|---------|---------|-------------------

With out the unit testing of the private inner methods.

11 specs, 0 failures
Finished in 65.361 seconds
----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files |   90.62 |    72.41 |      90 |   91.66 |
 index.js |   90.62 |    72.41 |      90 |   91.66 | 45,98,128,154,170
----------|---------|----------|---------|---------|-------------------

Checklist

[x] I've run the tests to see all new and existing tests pass
[ ] I added automated test coverage as appropriate for this change
[ ] Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
[ ] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
[ ] I've updated the documentation if necessary

apache / cordova-fetch