[e2e] fix generate support bundle test

[a110605]

Goal

• Fix typo in some test cases description
• Fix and stablize Generate support bundle test case.

Issue

#1195

Result

I ran mutliple times against to v1.3.0 harvester machine (https://172.19.108.23/) in ECM lab.
It average costs 1:55 ~ 2:10 min to generate and download the support bundle.

I increase the downloadTimeout to 240 second to avoid timeout issue and add some promise reject to make test case failed for any unexpected behavior.

[a110605]

Verified the change is good to pass on v1.2-head harvester (https://10.84.132.32).

It average costs 3:15 ~ 3:20 mins to gen and download support bundle.

[khushboo-rancher]

Thanks @a110605 For the fix.
For future, you can consider naming the PR starting with cypress, we generally use e2e for the backend test. :)

[a110605]

Thanks @a110605 For the fix. For future, you can consider naming the PR starting with cypress, we generally use e2e for the backend test. :)

Sure, thanks for let me know the convention.