Add support for --force-if-includes to force push more safely (#187932)

* Add support for `--force-if-includes` to force push

* Change force push failed error message

* Separate force push (no with lease) failed error message

* Switch to `"markdownDescription"`

* Add Git version requirement for config description

* Improve error message when safer force push is rejected

* Eliminate the option's effect if Git is too old

* Minor improvements to community contribution

---------

Co-authored-by: Ladislau Szomoru <3372902+lszomoru@users.noreply.github.com>

extensions/git/src/api/git.d.ts

@@ -16,7 +16,8 @@ export interface InputBox {
 
 export const enum ForcePushMode {
 	Force,
-	ForceWithLease
+	ForceWithLease,
+	ForceWithLeaseIfIncludes,
 }
 
 export const enum RefType {
@@ -366,6 +367,8 @@ export const enum GitErrorCodes {
 	StashConflict = 'StashConflict',
 	UnmergedChanges = 'UnmergedChanges',
 	PushRejected = 'PushRejected',
+	ForcePushWithLeaseRejected = 'ForcePushWithLeaseRejected',
+	ForcePushWithLeaseIfIncludesRejected = 'ForcePushWithLeaseIfIncludesRejected',
 	RemoteConnectionError = 'RemoteConnectionError',
 	DirtyWorkTree = 'DirtyWorkTree',
 	CantOpenResource = 'CantOpenResource',