Description of problem:
[RFE]Ability to view the guests selected during creating a migration plan on MTV

Version-Release number of selected component (if applicable):
MTV2.8.0

How reproducible:
100%

Steps to Reproduce:
1. There maybe hundreds and thousands of guests on vSphere provider

2.  It's hard to check what guests have selected as user needs to scroll the pages to check the guests, fox example, the screenshot below shows that 6 guests have been selected, but I can't remember which guests I selected and can't click the "6 VMs selected" icon to view them.

3. Besides, I also can't see what guests have selected before creating migration plan 

Actual results:
As above description

Expected results:
Although users can delete unwanted guests after creating a migration plan, users can't add new guests to the migration plan, so it is best to allow users to carefully confirm whether the selected guests are really needed before creating a migration plan.

Additional info: