chore: add reason tag in failed requests and failed events stats

[satishrudderstack]

Currently, we have stats for failed requests and failed events. With this change we will also be capturing the reason for the failure. Example reasons are invalidJson, invalidWriteKey

[codecov[bot]]

Codecov Report

Base: 45.30% // Head: 43.96% // Decreases project coverage by -1.34% :warning:

Coverage data is based on head (a91654e) compared to base (60bc1be). Patch coverage: 25.94% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2430      +/-   ##
==========================================
- Coverage   45.30%   43.96%   -1.35%     
==========================================
  Files         177      187      +10     
  Lines       36542    39108    +2566     
==========================================
+ Hits        16555    17193     +638     
- Misses      18911    20828    +1917     
- Partials     1076     1087      +11     

Impacted Files	Coverage Δ
processor/transformer/transformer.go	65.76% <0.00%> (-0.46%)	:arrow_down:
router/batchrouter/batchrouter.go	34.13% <0.00%> (-0.02%)	:arrow_down:
services/filemanager/filemanager.go	53.09% <0.00%> (-1.45%)	:arrow_down:
warehouse/admin.go	3.03% <0.00%> (ø)
warehouse/bigquery/bigquery.go	0.00% <0.00%> (ø)
warehouse/clickhouse/clickhouse.go	0.00% <0.00%> (ø)
warehouse/deltalake/deltalake.go	0.00% <0.00%> (ø)
warehouse/deltalake/query_builder.go	0.00% <0.00%> (ø)
warehouse/errors.go	0.00% <0.00%> (ø)
warehouse/identities.go	1.05% <0.00%> (-0.47%)	:arrow_down:
... and 43 more

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[satishrudderstack]

@lvrach Added a new commit to this PR. https://github.com/rudderlabs/rudder-server/pull/2430/commits/53779e3cbe1d662bfaa516f88b54487bfcce8028. Please take a look