[DOP-6758] Fix Hive.check() behavior when Hive Metastore is not available

[dolfinus]

Change Summary

1. Hive.check() now does not return successful result when Hive Metastore is not available.
2. Added check to all DB and FileDF connections that Spark session is alive.

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

Merging #164 (fe52691) into develop (32c37ed) will decrease coverage by 0.04%.
The diff coverage is 81.81%.

@@             Coverage Diff             @@
##           develop     #164      +/-   ##
===========================================
- Coverage    94.33%   94.29%   -0.04%     
===========================================
  Files          209      209              
  Lines         7925     7943      +18     
  Branches      1490     1494       +4     
===========================================
+ Hits          7476     7490      +14     
- Misses         326      328       +2     
- Partials       123      125       +2     

Files	Coverage Δ
onetl/connection/db_connection/hive/connection.py	91.07% <100.00%> (ø)
...etl/connection/db_connection/mongodb/connection.py	93.75% <ø> (ø)
...nnection/db_connection/db_connection/connection.py	94.11% <80.00%> (-5.89%)	⬇️
...ion/file_df_connection/spark_file_df_connection.py	88.00% <80.00%> (-1.02%)	⬇️

[dolfinus]

Replaced Spark session aliveness probe from spark.sql("SELECT 1").collect() to checking SparkContext attribute. Previous implementation generated jobs for Spark executor, and doing that on every constructor call is a bad idea.