Server: Reload TLS certs without a server restart (#83589)

* server: reload of grafana server certs when renewed without restart.

Signed-off-by: Rao, B V Chalapathi <b_v_chalapathi.rao@nokia.com>

* server: reload of grafana server certs when renewed without restart.

Signed-off-by: Rao, B V Chalapathi <b_v_chalapathi.rao@nokia.com>

* Update http_server.go

* Update docs/sources/setup-grafana/configure-grafana/_index.md

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

* Update http_server.go

Address the comments

* Update docs/sources/setup-grafana/configure-grafana/_index.md

Co-authored-by: Dan Cech <dan@aussiedan.com>

* Update http_server.go

Align the spaces

* Update http_server.go

* Update http_server.go

* Update pkg/api/http_server.go

Co-authored-by: Dan Cech <dan@aussiedan.com>

---------

Signed-off-by: Rao, B V Chalapathi <b_v_chalapathi.rao@nokia.com>
Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
Co-authored-by: Dan Cech <dan@aussiedan.com>

docs/sources/developers/http_api/admin.md

@@ -152,6 +152,7 @@ Content-Type: application/json
   "server":{
     "cert_file":"",
     "cert_key":"",
+    "certs_watch_interval": "0s",
     "domain":"mygraf.com",
     "enable_gzip":"false",
     "enforce_domain":"false",