build(java): use ENABLE_FLAKYBOT env variable (#633)

This PR was generated using Autosynth. 🌈 Synth log will be available here: https://source.cloud.google.com/results/invocations/2e6f5226-3b8a-4710-aad5-2e9602650041/targets - [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.) Source-Link: googleapis/synthtool@ff01716

Author: yoshi-automation

.kokoro/build.sh

@@ -115,7 +115,7 @@ fi
 # fix output location of logs
 bash .kokoro/coerce_logs.sh
 
-if [[ "${ENABLE_BUILD_COP}" == "true" ]]
+if [[ "${ENABLE_FLAKYBOT}" == "true" ]]
 then
  chmod +x ${KOKORO_GFILE_DIR}/linux_amd64/flakybot
  ${KOKORO_GFILE_DIR}/linux_amd64/flakybot -repo=googleapis/java-errorreporting

.kokoro/nightly/integration.cfg

@@ -22,7 +22,7 @@ env_vars: {
 }
 
 env_vars: {
- key: "ENABLE_BUILD_COP"
+ key: "ENABLE_FLAKYBOT"
  value: "true"
 }
 

.kokoro/nightly/samples.cfg

@@ -33,6 +33,6 @@ env_vars: {
 }
 
 env_vars: {
- key: "ENABLE_BUILD_COP"
+ key: "ENABLE_FLAKYBOT"
  value: "true"
 }

synth.metadata

@@ -4,7 +4,7 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/java-errorreporting.git",
- "sha": "a4f8a0099afd3e4562d5798b5c252b10d3160c84"
+ "sha": "38d64eea4317cb55fe11f3f5a94873cc4b4df06c"
  }
  },
  {
@@ -19,7 +19,7 @@
  "git": {
  "name": "synthtool",
  "remote": "https://github.com/googleapis/synthtool.git",
- "sha": "6252f2cd074c38f37b44abe5e96d128733eb1b61"
+ "sha": "ff01716e16d2c6e87eaf87197b753ac9fcbbed5d"
  }
  }
  ],