chore(java): update release_type choices to stable and preview (#1331)

* chore(java): update release_type choices to stable and preview

* chore: update badge names
Source-Link: googleapis/synthtool@d10357a
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:9669c169d0582f13d6b2d319a43a78fc49f296a883aa48519bd0e5c7d34087c4

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:491a007c6bd6e77f9e9b1bebcd6cdf08a4a4ef2c228c123d9696845204cb685d
+  digest: sha256:9669c169d0582f13d6b2d319a43a78fc49f296a883aa48519bd0e5c7d34087c4

.github/ISSUE_TEMPLATE/bug_report.md

@@ -21,7 +21,7 @@ If you are still having issues, please include as much information as possible:
    General, Core, and Other are also allowed as types
 2. OS type and version:
 3. Java version:
-4. google-http-client version(s):
+4.  version(s):
 
 #### Steps to reproduce