fix: release scripts from issuing overlapping phases (#434)

`mvn deploy` will run `mvn install` so specifying `mvn install deploy` is redundant at best. At worst, it will cause plugins like maven-shade-plugin to be executed twice re-shading itself Source-Author: Igor Bernstein <igorbernstein@google.com> Source-Date: Wed Apr 14 13:16:03 2021 -0400 Source-Repo: googleapis/synthtool Source-Sha: 8285c2b4cdbc3771d031ad91e1c4ec9e55fff45d Source-Link: googleapis/synthtool@8285c2b

Author: yoshi-automation

.kokoro/release/snapshot.sh

@@ -25,7 +25,7 @@ grep SNAPSHOT versions.txt
 setup_environment_secrets
 create_settings_xml_file "settings.xml"
 
-mvn clean install deploy -B \
+mvn clean deploy -B \
  --settings ${MAVEN_SETTINGS_FILE} \
  -DperformRelease=true \
  -Dgpg.executable=gpg \

.kokoro/release/stage.sh

@@ -29,7 +29,7 @@ create_settings_xml_file "settings.xml"
 
 # attempt to stage 3 times with exponential backoff (starting with 10 seconds)
 retry_with_backoff 3 10 \
- mvn clean install deploy -B \
+ mvn clean deploy -B \
  --settings ${MAVEN_SETTINGS_FILE} \
  -DskipTests=true \
  -DperformRelease=true \

synth.metadata

@@ -4,14 +4,14 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/java-spanner-jdbc.git",
- "sha": "da5084160a5c89552b57cf32e6af1e70e0d6b807"
+ "sha": "212d9d05c4f28ade71ab5484792188b11a5bcd8b"
  }
  },
  {
  "git": {
  "name": "synthtool",
  "remote": "https://github.com/googleapis/synthtool.git",
- "sha": "082e1ca0863b13ada8594fe91845380765da5b70"
+ "sha": "8285c2b4cdbc3771d031ad91e1c4ec9e55fff45d"
  }
  }
  ],