Created by: vovakulikov

UPDATE

This PR is depricated. It got too big IMO for a single request, plus it got muddied up with some merging from main. So I have extracted the important bits out to a new branch and will continue on from there.

Related PR: https://github.com/sourcegraph/sourcegraph/pull/27083

Context

Note: This PR is based on and should merge into this integration PR https://github.com/sourcegraph/sourcegraph/pull/26382

This PR implements minimal surface of GQL API class for code insights backend. Also since we're introducing some UI changes in the creation UI when users use code insights with the GQL backend this PR also adds some changes in the creation forms (hide insight visibility section and replace it with dashboard section). Design is still in review but you can find it here

Work in progress

• Support query for proper rendering creation UI
• Support lang stats insight creation in createInsight method API
• Implement proper getInsightById method using InsightView connection query (see latest graphql schema API https://github.com/sourcegraph/sourcegraph/pull/25993/files). At the moment getInsightById is partially implemented but it doesn't provide enough information for FE cause now it uses the old Insight connection API where we don't have info about insight types and etc things. With the InsightView connection, it should be fine we can use __typename field in the insight view presentation field to be able to distinguish line chart from pie chart (search insight from lang stats insight) We also should be able distinguish FE insight and BE insight (in BE insight we don't have repositories field and this is how we can make a difference between FE and BE insights)
• Implement updateInsight method. At the moment we don't have any mutation around that even in our latest API schema, This is blocked by BE implementation (need some input from @CristinaBirkel or @coury-clark)
• Check integration and unit tests

Closes https://github.com/sourcegraph/sourcegraph/issues/25877