feat: remove proto ReadEfficiencyStats (#1455)

* feat: remove proto ReadEfficiencyStats
feat: remove field RequestStats.read_efficiency_stats
feat: rename proto AllReadStats to FullReadStatsView
feat: rename field RequestStats.all_read_stats to full_read_stats_view
feat: rename proto ReadIteratorStats to ReadIterationStats
feat: remove enum value ReadRowsRequest.RequestStatsView.REQUEST_STATS_EFFICIENCY
feat: remove field ReadIterationStats.deletes_seen

PiperOrigin-RevId: 479370243

Source-Link: googleapis/googleapis@959d789

Source-Link: https://github.com/googleapis/googleapis-gen/commit/38b425264c03f3cdca279503c801c86604c8a67a
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMzhiNDI1MjY0YzAzZjNjZGNhMjc5NTAzYzgwMWM4NjYwNGM4YTY3YSJ9

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* 🦉 Updates from OwlBot post-processor

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* update clirr ignored differences

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* add note

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Kristen O'Leary <kaoleary@google.com>
Co-authored-by: kolea2 <45548808+kolea2@users.noreply.github.com>

Author: gcf-owl-bot[bot]

proto-google-cloud-bigtable-v2/clirr-ignored-differences.xml

@@ -16,4 +16,53 @@
     <className>com/google/bigtable/v2/*OrBuilder</className>
     <method>boolean has*(*)</method>
   </difference>
+
+  <!--  this proto was renamed and not exposed-->
+  <!--  todo: remove after next release-->
+  <difference>
+    <differenceType>7002</differenceType>
+    <className>com/google/bigtable/v2/RequestStats*</className>
+    <method>**</method>
+  </difference>
+  <difference>
+    <differenceType>8001</differenceType>
+    <className>com/google/bigtable/v2/AllReadStats*</className>
+  </difference>
+  <difference>
+    <differenceType>8001</differenceType>
+    <className>com/google/bigtable/v2/ReadEfficiencyStats*</className>
+  </difference>
+  <difference>
+    <differenceType>8001</differenceType>
+    <className>com/google/bigtable/v2/ReadIteratorStats*</className>
+  </difference>
+  <difference>
+    <differenceType>8001</differenceType>
+    <className>com/google/bigtable/v2/RequestStats$StatsCase</className>
+  </difference>
+  <difference>
+    <differenceType>6001</differenceType>
+    <className>com/google/bigtable/v2/ReadRowsRequest$RequestStatsView</className>
+    <field>REQUEST_STATS_EFFICIENCY</field>
+  </difference>
+  <difference>
+    <differenceType>6011</differenceType>
+    <className>com/google/bigtable/v2/ReadRowsRequest$RequestStatsView</className>
+    <field>REQUEST_STATS_EFFICIENCY_VALUE</field>
+  </difference>
+  <difference>
+    <differenceType>6011</differenceType>
+    <className>com/google/bigtable/v2/RequestStats</className>
+    <field>ALL_READ_STATS_FIELD_NUMBER</field>
+  </difference>
+  <difference>
+    <differenceType>6011</differenceType>
+    <className>com/google/bigtable/v2/RequestStats</className>
+    <field>READ_EFFICIENCY_STATS_FIELD_NUMBER</field>
+  </difference>
+  <difference>
+    <differenceType>6003</differenceType>
+    <className>com/google/bigtable/v2/ReadRowsRequest$RequestStatsView</className>
+    <field>REQUEST_STATS_FULL_VALUE</field>
+  </difference>
 </differences>