build(java): switch to release-please for release tagging (#516)

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.github/release-please.yml

@@ -1,2 +1,3 @@
+bumpMinorPreMajor: true
+handleGHRelease: true
 releaseType: java-yoshi
-bumpMinorPreMajor: true

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-translate.git",
-        "sha": "4d8072c58c3649c6ea482a17aa3b58e922e9776a"
+        "sha": "22b09a2d4c33f54f3b89cea4b68983077872f695"
       }
     },
     {