mvnCmd and gradleCmd should quote executable paths

[covener]

When I try to start a server from the Liberty Dashboard, there is a shell quoting problem running the maven within the extension:

covener@cov-osx2-2 httpclients-jssehelper % /Users/covener/Library/Application Support/Code/User/globalStorage/pleiades.java-extension-pack-jdk/maven/latest/bin/mvn io.openliberty.tools:liberty-maven-plugin:dev -f 
"/Users/covener/SRC/httpclients-jssehelper/pom.xml"
zsh: no such file or directory: /Users/covener/Library/Application

AFAIK there is nothing special about my vscode and my project is based on a recent guide.

IIUC devCommands.ts should either return a quoted path (when not returning the "mvn" or "gradle" verbatim) or the callers of mvnCmd/gradleCmd need to wrap the returned value similar to how the maven plugin does with the references you can find to this utility function: https://github.com/microsoft/vscode-maven/blob/2ab8f392f418c8e0fe2903387f2b0013a1c50e78/src/utils/mavenUtils.ts#L170

https://github.com/OpenLiberty/liberty-tools-vscode/blob/main/src/liberty/devCommands.ts#L112

liberty-tools-vscode/src/liberty/devCommands.ts

Line 537 in 29ecc9a

export async function mvnCmd(pomPath: string): Promise<string> {