Added check for the 'show' prop before making API request for the link tooltip.

[raghavaggarwal2308]

Summary

• Added check for the 'show' prop before making API request for the link tooltip.
• Added check if the data is already present for the link, do not make new API requests.

What to test?

• API request to fetch the data is sent when we hover over a Gitlab issue/PR link.
• API request is not sent if we have already made a request in the past and have not refreshed the page after that.

Steps to test:

1. Connect your Gitlab account.
2. Open the network tab of your browser.
3. Hover over a Gitlab issue/PR link.

Ticket Link

Fixes: https://community.mattermost.com/core/pl/zao9gnwgjpf6mmeo9y9xu8kngy

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7834d0f) 33.50% compared to head (1485e82) 33.38%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #453      +/-   ##
==========================================
- Coverage   33.50%   33.38%   -0.12%     
==========================================
  Files          22       22              
  Lines        4000     4014      +14     
==========================================
  Hits         1340     1340              
- Misses       2527     2541      +14     
  Partials      133      133              

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[mickmister]

I'm thinking we should also have the return value of the component be null when props.show is false, just as we are doing here:

mattermost-plugin-gitlab/webapp/src/components/link_tooltip/link_tooltip.jsx

Lines 121 to 123 in b8940f8

	if (!data) {
	return null;
	}

[raghavaggarwal2308]

@mickmister Updated