fix: re-add lb controller nginx example

[Zvikan]

What does this PR do?

• re-adds AWS lb controller to the nginx example
• fix nginx example README to use correct cli command for TF destroy

Motivation

• part of PR and commit in bdeef58#diff-fcdd8d00f7a7978adb63eea56e712bf41b4ddf153bf7b76d1c68d82e80dcd895L139-L150 was done by a mistake and should be reverted.

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs required examples and docs except a new pattern or add-on added.

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[Zvikan]

Testing e2e with this change to ensure the example is working again.

[vara-bonthu]

LGTM

[Zvikan]

Can confirm e2e nginx example passed(apply and destroy) using this change.

[askulkarni2]

LGTM!