Make history events expandable on summary page

[feedmeapples]

What was changed:

Clicking on summary events expands them and shows details.

This is done by changing the eventId query parameter type from int to string, because grpc lib converts proto int64 fiields into strings, such as below becomes a string

message HistoryEvent {
    int64 event_id = 1;

Why?

Makes the summary events expand on clicking

Checklist

1. Closes issue:

2. How was this tested:

• Open any workflow -> grid -> Summary
• Click on any event
• expected: Event expands and shows details

3. Any docs updates needed?

No