Add goto issue id function (#24479)

for
https://github.com/go-gitea/gitea/issues/4109#issuecomment-1527104992

Supports format:
`#1234`
`Org/Repo#1234`

---------

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

templates/user/dashboard/issues.tmpl

@@ -78,7 +78,8 @@
 							<input type="hidden" name="sort" value="{{$.SortType}}">
 							<input type="hidden" name="state" value="{{$.State}}">
 							<input name="q" value="{{$.Keyword}}" placeholder="{{.locale.Tr "explore.search"}}...">
-							<button class="ui small icon button" type="submit" aria-label="{{.locale.Tr "explore.search"}}">{{svg "octicon-search"}}</button>
+							<button id="hashtag-button" class="ui small icon button gt-hidden" data-tooltip-content="{{.locale.Tr "explore.go_to"}}">{{svg "octicon-hash"}}</button>
+							<button id="search-button" class="ui small icon button" aria-label="{{.locale.Tr "explore.search"}}">{{svg "octicon-search"}}</button>
 						</div>
 					</form>
 					<!-- Sort -->