fix: updated version of search endpoint /search/v2/jobs/export

[thilles]

The endpoint /search/jobs/export is depricated as of Splunk version 9.0.1. Updated to use v2 of endpoint.
Ref https://docs.splunk.com/Documentation/Splunk/9.2.1/RESTREF/RESTsearch#search.2Fjobs.2Fexport_.28deprecated.29

[fantavlik]

Ah good call, thanks for the contribution. I wonder if it may be a bit early to force all users of the VSCode extension to be on Splunk 9.0.2 or later? Some options if we want to avoid that:

1. Allow an extension setting to opt into v2 endpoints (on by default) that users on older versions of Splunk could opt out of
2. Adopt the splunk-javascript-sdk for these calls, that SDK automatically checks which Splunk version is being used and uses v2 when available
3. Hard cutover to v2 which would make the VSCode extension only usable for Splunk versions 9.0.2 and later (we would at least need to advertise this quite loudly if we go that route)

@JasonConger thoughts?

[JasonConger]

Thanks for the contribution @thilles. We always welcome contributions from the community!
@fantavlik adding an option in the extension to choose an endpoint would be okay in the short-term, but refactoring for the splunk-javascript-sdk would be the preferred long-term outcome.

[fantavlik]

FYI I went for the long term option since it was easy enough - the SDK doesn't support the export endpoints but I used the SDK to determine which endpoints to use in this PR: #127