Save selected teams filter in local storage (#1613)

# What this PR does

Selected teams filter is now saved in local storage

## Which issue(s) this PR fixes

https://github.com/grafana/oncall/issues/1611

## Checklist

- [ ] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)

---------

Co-authored-by: Joey Orlando <joey.orlando@grafana.com>

CHANGELOG.md

@@ -42,6 +42,10 @@ Only some minor performance/developer setup changes to report in this version.
 
 ## v1.2.2 (2023-03-27)
 
+### Added
+
+- Save selected teams filter in local storage ([1611](https://github.com/grafana/oncall/issues/1611))
+
 ### Changed
 
 - Drawers with Forms are not closing by clicking outside of the drawer. Only by clicking Cancel or X (by @Ukochka in [#1608](https://github.com/grafana/oncall/pull/1608))

grafana-plugin/src/models/filters/filters.ts

@@ -3,10 +3,13 @@ import { action, observable } from 'mobx';
 import BaseStore from 'models/base_store';
 import { makeRequest } from 'network';
 import { RootStore } from 'state';
+import { getItem, setItem } from 'utils/localStorage';
 
 import { getApiPathByPage } from './filters.helpers';
 import { FilterOption, FiltersValues } from './filters.types';
 
+const LOCAL_STORAGE_FILTERS_KEY = 'grafana.oncall.global-filters';
+
 export class FiltersStore extends BaseStore {
   @observable.shallow
   public options: { [page: string]: FilterOption[] } = {};
@@ -14,10 +17,25 @@ export class FiltersStore extends BaseStore {
   @observable.shallow
   public values: { [page: string]: FiltersValues } = {};
 
-  public globalValues: FiltersValues = {};
+  private _globalValues: FiltersValues = {};
 
   constructor(rootStore: RootStore) {
     super(rootStore);
+
+    const savedFilters = getItem(LOCAL_STORAGE_FILTERS_KEY);
+    if (savedFilters) {
+      this._globalValues = { ...savedFilters };
+    }
+  }
+
+  set globalValues(value: any) {
+    this._globalValues = value;
+
+    setItem(LOCAL_STORAGE_FILTERS_KEY, value);
+  }
+
+  get globalValues() {
+    return this._globalValues;
   }
 
   @action