BigQuery: Fixes When Table,Dataset and Job is not found

[pmakani]

Fixes#3930 getTable(), getDataset() and getJob().

[sduskis]

@pmakani, can you please resolve the conflicts?

[codecov]

Codecov Report

Merging #4389 into master will decrease coverage by 4.1%.
The diff coverage is 33.33%.

@@ Coverage Diff @@## master #4389 +/- ##
============================================
- Coverage 49.19% 45.08% -4.11% - Complexity 21957 25313 +3356 
============================================
Files 2076 2078 +2 Lines 207407 247282 +39875 Branches 24108 31911 +7803 ============================================
+ Hits 102030 111491 +9461 - Misses 97205 126040 +28835 - Partials 8172 9751 +1579

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/google/cloud/bigquery/BigQueryImpl.java	83.46% <0%> (-0.81%)	49 <0> (ø)
...ava/com/google/cloud/bigquery/BigQueryOptions.java	88.88% <100%> (+1.01%)	11 <2> (+2)	⬆️
...loud/bigtable/data/v2/internal/RequestContext.java	33.33% <0%> (-66.67%)	2% <0%> (ø)
...gtable/admin/v2/BigtableInstanceAdminSettings.java	82.14% <0%> (-17.86%)	5% <0%> (-1%)
...com/google/cloud/bigquery/QueryParameterValue.java	65.32% <0%> (-7.05%)	43% <0%> (-3%)
...va/com/google/cloud/redis/v1/CloudRedisClient.java	53.93% <0%> (-6.07%)	23% <0%> (-12%)
...ble/data/v2/stub/EnhancedBigtableStubSettings.java	93.19% <0%> (-5.37%)	15% <0%> (-2%)
...gle/cloud/bigtable/data/v2/BigtableDataClient.java	84.31% <0%> (-5.27%)	32% <0%> (ø)
...a/com/google/cloud/bigquery/LegacySQLTypeName.java	91.17% <0%> (-3.95%)	4% <0%> (-3%)
...1/TargetHttpsProxiesSetSslCertificatesRequest.java	19.48% <0%> (-3.93%)	7% <0%> (+2%)
... and 794 more

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[pmakani]

@sduskis PTAL.