Explore/Refactor: Simplify URL handling (#29173)

* Inline datasource actions into initialisation

* Simplify url handling

* Add comments

* Remove split property from state and split Explore.tsx to 2 components

* Add comments

* Simplify and fix splitOpen and splitClose actions

* Update public/app/features/explore/ExplorePaneContainer.tsx

Co-authored-by: Giordano Ricci <gio.ricci@grafana.com>

* Update public/app/features/explore/state/explorePane.test.ts

Co-authored-by: Giordano Ricci <gio.ricci@grafana.com>

* Update public/app/features/explore/Wrapper.tsx

Co-authored-by: Ivana Huckova <30407135+ivanahuckova@users.noreply.github.com>

* Fix test

* Fix lint

Co-authored-by: Giordano Ricci <gio.ricci@grafana.com>
Co-authored-by: Ivana Huckova <30407135+ivanahuckova@users.noreply.github.com>

public/app/types/explore.ts

@@ -5,7 +5,6 @@ import {
   DataQuery,
   DataQueryRequest,
   DataSourceApi,
-  ExploreUrlState,
   HistoryItem,
   LogLevel,
   LogsDedupStrategy,
@@ -26,10 +25,6 @@ export enum ExploreId {
  * Global Explore state
  */
 export interface ExploreState {
-  /**
-   * True if split view is active.
-   */
-  split: boolean;
   /**
    * True if time interval for panels are synced. Only possible with split mode.
    */
@@ -41,7 +36,7 @@ export interface ExploreState {
   /**
    * Explore state of the right area in split view.
    */
-  right: ExploreItemState;
+  right?: ExploreItemState;
   /**
    * History of all queries
    */
@@ -134,17 +129,6 @@ export interface ExploreItemState {
    */
   refreshInterval?: string;
 
-  /**
-   * Copy of the state of the URL which is in store.location.query. This is duplicated here so we can diff the two
-   * after a change to see if we need to sync url state back to redux store (like on clicking Back in browser).
-   */
-  urlState: ExploreUrlState | null;
-
-  /**
-   * Map of what changed between real url and local urlState so we can partially update just the things that are needed.
-   */
-  update: ExploreUpdateState;
-
   latency: number;
 
   /**
@@ -156,7 +140,6 @@ export interface ExploreItemState {
    * If true, the live tailing view is paused.
    */
   isPaused: boolean;
-  urlReplaced: boolean;
 
   querySubscription?: Unsubscribable;