fix(@angular-devkit/architect): propagate option validation errors

[clydin]

By using the SchemaValidationException object, the underlying JSON schema validation errors will be propagated to the consuming code. This allows for more detailed error reporting of malformed or incorrectly provided options.

Partially addresses #14269

[filipesilva]

Can you add tests for the contents of these two errors?

The second one can be validated by replacing

angular-cli/packages/angular_devkit/architect/src/index_spec.ts

Lines 303 to 306 in feb04a9

	try {
	await run2.output.toPromise();
	expect('THE ABOVE LINE SHOULD NOT ERROR').toBe('false');
	} catch {}

With

    try {
      await run2.output.toPromise();
      expect('THE ABOVE LINE SHOULD NOT ERROR').toBe('false');
    } catch (error) {
      expect(error.message).toContain(`Data path "" should have required property 'p1'`);
    }

The first one doesn't have a matching test I think.

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