Cherry pick tikv#2454 to release-4.0 (tikv#2457)

* Cherry pick tikv#2454

Signed-off-by: Breezewish <[email protected]>

* Add TiDB Dashboard configurations

Signed-off-by: Breezewish <[email protected]>

* Fix race

Signed-off-by: Breezewish <[email protected]>

* Cherry pick tikv#2460

Signed-off-by: Breezewish <[email protected]>

dashboard: update to 0514 (tikv#2421)

* dashboard: update to 0514

Signed-off-by: Zheng Xiangsheng <[email protected]>

bump to 3.0.14

Signed-off-by: qupeng <[email protected]>

bump to 3.0.13

Signed-off-by: qupeng <[email protected]>

Dependency: Update kvproto to tikv#605, which change binary path to d…

…eploy path. (tikv#2383)

Signed-off-by: mapleFU <[email protected]>

*: unify the http client (tikv#2368) (tikv#2381)

Signed-off-by: nolouch <[email protected]>
Signed-off-by: Ryan Leung <[email protected]>

*: picks some hot-region improvements to release 3.1 (tikv#2342)

Signed-off-by: nolouch <[email protected]>
Signed-off-by: lhy1024 <[email protected]>