DYN-6058 - UI changed location for Package Download toast

[dnenov]

Purpose

This is a small UI fix to the Search for packages window. When a package is downloaded, a (toast) notification is shown in the bottom row of the window. This row was observed to have started displaying a bit higher than it should. This PR addressed the issue.

Jira task

Figma link

UI Snapshot

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

• Removed margin bottom offsets to the last 2 grid rows as to lessen the amount of offset the Toast row is pushed up from the bottom of the window. The figma mock-up shows a thick gray bottom line which partly hides the gap - that line is not to be implemented, though, and was present in the figma document by mistake (checked with the team). 

Reviewers

@avidit

FYIs

@reddyashish
@Jingyi-Wen