Add a pause or timeout for all windows .bat scripts

GUI oriented Windows users might simply double click on the .bat scripts to run in interactive mode, which will launch a terminal window to run the script. If java is not found, the terminal window will **immediately** close without the user having a chance to actually read the error. Some users might not know/consider running via a command-line session (rather than double-clicking) to get around this. Adding a pause or timeout would be trivial and give users an opportunity to read the terminal output.
Submitting for discussion prior to PR per contribution guidelines

**Examples:**

```diff
if not defined JAVA_HOME (
set JAVA_EXEC=java
echo No Java Home was found. Using current path. If execution fails please install Java and make sure it is in the search path or exposed via the JAVA_HOME environment variable.
+ pause
) else (
```

```diff
if not defined JAVA_HOME (
set JAVA_EXEC=java
echo No Java Home was found. Using current path. If execution fails please install Java and make sure it is in the search path or exposed via the JAVA_HOME environment variable.
+ timeout 3
) else (
```
```diff
if not defined JAVA_HOME (
set JAVA_EXEC=java
echo No Java Home was found. Using current path. If execution fails please install Java and make sure it is in the search path or exposed via the JAVA_HOME environment variable.
+ timeout 3 > NUL
) else (
```

---

Alternatively, we can add this to the end of the script to keep the window open regardless of the outcome.

**Examples:**

```diff
"%JAVA_EXEC%" %DIAG_JAVA_OPTIONS% -cp %diagpath%\config;%diagpath%\lib\* co.elastic.support.diagnostics.DiagnosticApp %*
+echo.
+ pause
endlocal
```

```diff
"%JAVA_EXEC%" %DIAG_JAVA_OPTIONS% -cp %diagpath%\config;%diagpath%\lib\* co.elastic.support.diagnostics.DiagnosticApp %*
+ timeout 3
endlocal
```

```diff
"%JAVA_EXEC%" %DIAG_JAVA_OPTIONS% -cp %diagpath%\config;%diagpath%\lib\* co.elastic.support.diagnostics.DiagnosticApp %*
+ timeout 3 > NUL
endlocal
```