Change priorities of GPR-based commands

These commands can be executed immediately to unblock
the Ada & SPARK VS Code extension when some Ada file
editors are already opened.

This allows to speed-up the extension's initialization, triggering
the indexing sooner.

For eng/ide/ada_language_server#1473

Author: AnthonyLeonardoGracio

source/ada/lsp-ada_handlers-executables_commands.ads

@@ -41,7 +41,7 @@ private
 
    overriding function Priority (Self : Command)
      return LSP.Server_Jobs.Job_Priority
-       is (LSP.Server_Jobs.Low);
+       is (LSP.Server_Jobs.Immediate);
 
    for Command'External_Tag use "als-executables";
 

source/ada/lsp-ada_handlers-other_file_commands.ads

@@ -43,7 +43,7 @@ private
 
    overriding function Priority (Self : Command)
      return LSP.Server_Jobs.Job_Priority
-       is (LSP.Server_Jobs.Low);
+       is (LSP.Server_Jobs.Immediate);
 
    for Command'External_Tag use "als-other-file";
 

source/ada/lsp-ada_handlers-show_dependencies_commands.ads

@@ -47,7 +47,7 @@ private
 
    overriding function Priority (Self : Command)
      return LSP.Server_Jobs.Job_Priority
-       is (LSP.Server_Jobs.Low);
+       is (LSP.Server_Jobs.Immediate);
 
    for Command'External_Tag use "als-show-dependencies";