All TypeScript files have been updated to pass the new eslint-based linting checks. eslint compatible disabling comments have also been added in place of the previous tslint comments.
Previously, `addSymbolToNgModuleMetadata()` assumed that the added
symbol would not span multiple lines. In most cases, the added symbol is
a single word, so this assumption was correct. In some cases, however,
we might want to add a mutli-line string, such as a static method of an
`@NgModule`:
```ts
imports: [
SomeModule.staticMethod({
prop1: 'val1',
prop2: 'val2'
})
]
```
This commit allows `addSymbolToNgModuleMetadata()` to correctly handle
multi-line strings by ensuring that added metadata symbols are always
put on a new line (even if the array is empty) and each line in the
string is indented as necessary.
This aligns options that do the same thing:
1) `skipSpecs` and `spec` has been deprecated in favor of `skipTests`.
2) `styleext` has been deprecated in favor of `style` since the latest is two words.
Fixes#12784
