Explore: Fix context view in logs, where some rows may have been filtered out. (#21729)

* Fix timestamp formats and use uid to filter context rows

* Remove timestamps from tests

public/app/features/explore/LiveLogs.test.tsx

@@ -70,7 +70,6 @@ const makeLog = (overides: Partial<LogRowModel>): LogRowModel => {
     hasAnsi: false,
     labels: {},
     raw: entry,
-    timestamp: '',
     timeFromNow: '',
     timeEpochMs: 1,
     timeLocal: '',

public/app/features/explore/utils/ResultProcessor.test.ts

@@ -187,7 +187,6 @@ describe('ResultProcessor', () => {
               timeFromNow: 'fromNow() jest mocked',
               timeLocal: 'format() jest mocked',
               timeUtc: 'format() jest mocked',
-              timestamp: 300,
               uid: '2',
               uniqueLabels: {},
             },
@@ -205,7 +204,6 @@ describe('ResultProcessor', () => {
               timeFromNow: 'fromNow() jest mocked',
               timeLocal: 'format() jest mocked',
               timeUtc: 'format() jest mocked',
-              timestamp: 200,
               uid: '1',
               uniqueLabels: {},
             },
@@ -223,7 +221,6 @@ describe('ResultProcessor', () => {
               timeFromNow: 'fromNow() jest mocked',
               timeLocal: 'format() jest mocked',
               timeUtc: 'format() jest mocked',
-              timestamp: 100,
               uid: '0',
               uniqueLabels: {},
             },