CSV report is using timezone from default Space instead of the current Space

[immon]

Kibana version: 7.8.0

Elasticsearch version: 7.8.0

Server OS version: ubuntu 18.04

Browser version: firefox 77

Browser OS version: ubuntu 18.04

Original install method (e.g. download page, yum, from source, etc.): tar

Describe the bug:

CSV report does use timezone from default Space instead of the current Space.

Steps to reproduce:

1. Create index with one document

POST myindex/_doc
{
  
  "@timestamp": "2020-06-29T12:00:00Z",
  "messages": "utc noon"
}

2. In the default Space change dateFormat:tz to Europe/Warsaw
3. Create new Space with dateFormat:tz set to US/East
4. In the default Space create index pattern and in Discover find the document. Save search, and generate CSV report.
5. Report generated in default space does include correct timestamp:

"@timestamp","_id","_index","_score","_type",messages
"Jun 29, 2020 @ 14:00:00.000","t6xo_3IB62SZoyLfRA1w",00569380,,"_doc","utc noon"

6. Switch to newly created Space and repeat steps from 4 in this space.
7. In Discover document has correct timestamp listed: @timestamp: Jun 29, 2020 @ 08:00:00.000 messages: utc noon however CSV report includes timestamp "Jun 29, 2020 @ 14:00:00.000" which is incorrect.
   Timestamp in CSV should be 8:00 since it's US/East timezone but it's 14:00 as per timezone from default Space.

This bug is different from #56497 since I don't use Browser as a timezone.
Might be related to #68718

Expected behavior:

CSV report should use current space timezone.

Screenshots (if relevant):

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context:

[elasticmachine]

Pinging @elastic/kibana-reporting-services (Team:Reporting Services)

[tsullivan]

Similar to #68076

[Dosant]

@tsullivan, I think this wasn't fixed by #76998.

Reproduced in 7.9.1 and master:

1. Create a space and set some custom timezone for that space
2. Export CSV.
3. See dates in timezone from default space

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[tsullivan]

Replacing with #84717