Persist build-scan-capture init script into Gradle User Home

Instead of writing this file to a temp directory and referencing it
on the Gradle command line, the init script is now written to Gradle
User Home so that it is picked up automatically.

src/execution.ts

@@ -1,15 +1,10 @@
 import * as exec from '@actions/exec'
 import fs from 'fs'
 import path from 'path'
-import {writeInitScript} from './build-scan-capture'
 
 export async function execute(executable: string, root: string, args: string[]): Promise<BuildResult> {
     let buildScanUrl: string | undefined
 
-    const initScript = writeInitScript()
-    args.push('--init-script')
-    args.push(initScript)
-
     const buildScanFile = path.resolve(root, 'gradle-build-scan.txt')
     if (fs.existsSync(buildScanFile)) {
         fs.unlinkSync(buildScanFile)