[MINOR] Rename broken codecov file (#3088)

- Stop polluting PRs with wrong coverage info
- Retaining the file, so someone can try digging in

.codecov.yml

@@ -1,89 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.
-# The ASF licenses this file to You under the Apache License, Version 2.0
-# (the "License"); you may not use this file except in compliance with
-# the License.  You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# For more configuration details:
-# https://docs.codecov.io/docs/codecov-yaml
-
-# Check if this file is valid by running in bash:
-# curl -X POST --data-binary @.codecov.yml https://codecov.io/validate
-
-coverage:
-  precision: 2
-  round: down
-  range: "50...100"
-
-# Ignoring Paths
-# --------------
-# which folders/files to ignore
-ignore:
-  - "hudi-common/src/main/java/org/apache/hudi/avro/model/*"
-  - "hudi-common/src/main/java/org/apache/hudi/avro/MercifulJsonConverter.java"
-  - "hudi-common/src/main/java/org/apache/hudi/common/HoodieJsonPayload"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/HoodieCleaner.java"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/HoodieCompactionAdminTool.java"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/HoodieCompactor.java"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/HoodieSnapshotCopier.java"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/HoodieWithTimelineServer.java"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/UpgradePayloadFromUberToApache.java"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/perf/TimelineServerPerf.java"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/HDFSParquetImporter.java"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/HiveIncrementalPuller.java"
-  - "hudi-utilities/src/main/java/org/apache/hudi/utilities/adhoc/UpgradePayloadFromUberToApache.java"
-  - "hudi-client/src/main/java/org/apache/hudi/metrics/JmxMetricsReporter.java"
-  - "hudi-client/src/main/java/org/apache/hudi/metrics/JmxReporterServer.java"
-  - "hudi-client/src/main/java/org/apache/hudi/metrics/MetricsGraphiteReporter.java"
-  - "hudi-hadoop-mr/src/main/java/com/uber/hoodie/hadoop/HoodieInputFormat.java"
-  - "hudi-hadoop-mr/src/main/java/com/uber/hoodie/hadoop/realtime/HoodieRealtimeInputFormat.java"
-
-comment:
-  layout: "reach, diff, flags, files"
-  behavior: default
-  require_changes: false  # if true: only post the comment if coverage changes
-  require_base: no        # [yes :: must have a base report to post]
-  require_head: no        # [yes :: must have a head report to post]
-  branches:               # https://docs.codecov.io/docs/pull-request-comments#branches
-    - "master"
-
-flags:
-  hudicli:
-    paths:
-      - hudi-cli/src/main/
-  hudiclient:
-    paths:
-      - hudi-client/src/main/
-  hudicommon:
-    paths:
-      - hudi-common/src/main/
-  hudiexamples:
-    paths:
-      - hudi-examples/src/main/
-  hudihadoopmr:
-    paths:
-      - hudi-hadoop-mr/src/main/
-  hudihivesync:
-    paths:
-      - hudi-hive-sync/src/main/
-  hudiintegtest:
-    paths:
-      - hudi-integ-test/src/main/
-  hudispark:
-    paths:
-      - hudi-spark/src/main/
-  huditimelineservice:
-    paths:
-      - hudi-timeline-service/src/main/
-  hudiutilities:
-    paths:
-      - hudi-utilities/src/main/