chore: Remove Code Coverage requirements (googleapis#1871)

* chore: Remove Code Coverage requirements

* chore: Remove redelcaration in child pom

Author: lqiu96

oauth2_http/pom.xml

@@ -234,33 +234,6 @@
           <reportNameSuffix>sponge_log</reportNameSuffix>
         </configuration>
       </plugin>
-      <plugin>
-        <groupId>org.jacoco</groupId>
-        <artifactId>jacoco-maven-plugin</artifactId>
-        <version>0.8.12</version>
-        <executions>
-          <execution>
-            <id>jacoco-check</id>
-            <goals>
-              <goal>check</goal>
-            </goals>
-            <configuration>
-              <rules>
-                <rule>
-                  <element>BUNDLE</element>
-                  <limits>
-                    <limit>
-                      <counter>LINE</counter>
-                      <value>COVEREDRATIO</value>
-                      <minimum>0.910</minimum>
-                    </limit>
-                  </limits>
-                </rule>
-              </rules>
-            </configuration>
-          </execution>
-        </executions>
-      </plugin>
     </plugins>
   </build>