Dashboard: Add week start option to global and dashboard preferences (#40010)

* Add global week start option to shared preferences

* Add default_week_start to configuration docs

* Add week start option to dashboards

* Add week start argument to tsdb time range parser

* Fix strict check issues

* Add tests for week start

* Change wording on default_week_start documentation

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

* Update week_start column to be a nullable field

Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>

* Update configuration to include browser option

* Update WeekStartPicker container selector

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>

* Add menuShouldPortal to WeekStartPicker to remove deprecation warning

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

* Add inputId to WeekStartPicker

* Use e2e selector on WeekStartPicker aria-label

* Simplify WeekStartPicker onChange condition

* Specify value type on WeekStartPicker weekStarts

* Remove setWeekStart side effect from reducer

* Fix updateLocale failing to reset week start

* Store week start as string to handle empty values

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>
Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>
Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

pkg/models/preferences.go

@@ -12,6 +12,7 @@ type Preferences struct {
 	Version         int
 	HomeDashboardId int64
 	Timezone        string
+	WeekStart       string
 	Theme           string
 	Created         time.Time
 	Updated         time.Time
@@ -44,5 +45,6 @@ type SavePreferencesCommand struct {
 
 	HomeDashboardId int64  `json:"homeDashboardId"`
 	Timezone        string `json:"timezone"`
+	WeekStart       string `json:"weekStart"`
 	Theme           string `json:"theme"`
 }