Fix "vpcIdRef" field in EC2 and Route53 subresources

[ezgidemirel]

Signed-off-by: ezgidemirel ezgidemirel91@gmail.com

Description of your changes

This PR replaces "vpcidRef" fields with "vpcIdRef" in EC2 and Route53 subresources. In addition to that, it refactors reference addition in some of the resources. Instead of creating a new map and assign it to references, we should append new keys during resource configurations.

Fixes #153

I have:

• [x] Read and followed Crossplane's contribution process.
• [x] Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

I applied example manifests of VPC and Subnet resources.

[muvaf]

/backport release-0.4

[github-actions[bot]]

Successfully created backport PR #156 for release-0.4.