style(cred,source,scan): ds-438 popup style fix

[nicolearagao]

Unify popup style across Sources, Creds, Scans
Remove cancel button

Notes

• fix to "[Mirek] On “Sources” list. I can click a number in “Credentials” column and that will open new popup window. That window has both “close” button and “cancel” link (all lowercase). “close” is with red background, as if that was destructive action. That popup should probably use the same style as “Last connected” popup - it is purely informative.
  The same applies to popup that appears on “Credentials” page, when clicking number in “Sources” column
  It also appears on “Scans” page, when clicking number in “Sources” column"

How to test

Coverage and basic unit test check

1. update the NPM packages with $ npm install
2. $ npm test
3. confirm tests come back clean

Local run check

1. update the NPM packages with $ npm install
2. $ npm run start
3. confirm connections display as intended

Example

Updates issue/story

DISCOVERY-438

[cdcabrera]

technical implementation lgtm!