'Share with Percona' option doesn't export all panels

User Impact: 

• Share with Percona doesn't export all data panels from dashboards. this lead to incomplete data for the Support team and complications to do their work. 

 Steps to reproduce:
1. Go to https://pmmdemo.percona.com/graph/d/pxc-node-summary/pxc-galera-node-summary?orgId=1&refresh=1m
2.Do NOT  scroll the page 

3. Export with ,,share with percona''

4. Open generated URL 

Expected results:

Snapshot with all panels populated 

Given result:

On Snapshot, user can see only  some, top dashboards

Workaround: 

• Scroll the page to the end, wait until all panels populated.

• Do Snapshot after this 

Note: 

Compare the snapshot with the actual dashboard.

Samples:

• https://snapshots-g710.percona.com/dashboard/snapshot/wfIn7Lrw4x2iC6DcXabXfUaDeNmZbXR5?orgId=1
  

  Open

• https://snapshots-g710.percona.com/dashboard/snapshot/S1xYCzZcyBgVhuTgcICx1YygfbDp0Nwj
  

  Open

This is an important feature, as we are asking our customers to use that.

Looks like there are some lazy load problem with Grafana