Script standardization for core to make them follow only Track2

[KarishmaGhiya]

• Remove extra script for core packages. Like the following in core-http:

 "cover:unit:node": "nyc npm run unit-test:node",
    "check:packagejsonversion": "ts-node ./.scripts/checkPackageJsonVersion.ts",
    "check:foronlycalls": "ts-node ./.scripts/checkForOnlyCalls.ts",
    "check:everything": "ts-node ./.scripts/checkEverything.ts",
    "dep:autorest.typescript": "npx ts-node .scripts/testDependentProjects.ts autorest.typescript 'gulp build' 'gulp regenerate' 'npm run local'",
    "dep:ms-rest-azure-js": "npx ts-node .scripts/testDependentProjects.ts ms-rest-azure-js",
    "publish-preview": "mocha --no-colors && shx rm -rf dist/test && node ./.scripts/publish",
    "local": "ts-node ./.scripts/local.ts",
    "latest": "ts-node ./.scripts/latest.ts",