npm detection not reliable and redundant

[hohwille]

We have the commandlets that call npm and have redundant logic to detect it that also seems to be buggy.
The commandlets based on npm are:

• ionic
• ng
• yarn

Instead of finding npm inside these commandlets to call doRunCommand "npm install ..." we should simply delegate to doDevonCommand npm install ....

Copied from PR #934:
During the setup of npm a 'MODULE_NOT_FOUND' blocks the installation of ionic.
To be more precise, I've been getting the following error after the installation of node seemed
to be complete:

`node:internal/modules/cjs/loader:998
throw err;
^

Error: Cannot find module '/home/dr/projects/PR934/software/node/bin/node_modules/npm/bin/npm-cli.js'
at Module._resolveFilename (node:internal/modules/cjs/loader:995:15)
at Module._load (node:internal/modules/cjs/loader:841:27)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:82:12)
at node:internal/main/run_main_module:23:47 {
code: 'MODULE_NOT_FOUND',
requireStack: []
}

Node.js v19.0.0
Could not determine Node.js install directory

******** ATTENTION ********
Failed to install ionic-cli ('/home/dr/projects/PR934/software/node/npm')
We are sorry for the inconvenience. Please check the above errors, resolve them and try again.
Exit code was 1
`

Full log of this error can be found here: https://github.com/alfeilex/ide/actions/runs/3368418467/jobs/5586938443#step:4:11593

In my case the npm-cli.js file has the following path

/home/dr/projects/PR934/software/node/node_modules/npm/bin/npm-cli.js

instead of

/home/dr/projects/PR934/software/node/bin/node_modules/npm/bin/npm-cli.js

It seems that the errors occurs because the npm_command uses the path from here:

ide/scripts/src/main/resources/scripts/command/ionic

Line 28 in d9ebcad

local npm_command="${DEVON_IDE_HOME}/software/node/npm"

but it must be the path from here:

ide/scripts/src/main/resources/scripts/command/ionic

Line 31 in d9ebcad

npm_command="${DEVON_IDE_HOME}/software/node/bin/npm"