Adding legacy UI route for traces

[ps48]

Signed-off-by: Shenoy Pratik sgguruda@amazon.com

Description

Fixes the old trace analytics link, redirects to the current trace home inside observability.

Issues Resolved

#281

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[codecov-commenter]

Codecov Report

Merging #653 (8e836f9) into main (6b30bee) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #653   +/-   ##
=========================================
  Coverage     59.46%   59.46%           
  Complexity      283      283           
=========================================
  Files           236      236           
  Lines          7735     7735           
  Branches       1552     1552           
=========================================
  Hits           4600     4600           
  Misses         2963     2963           
  Partials        172      172           

Flag	Coverage Δ
dashboards-observability	52.85% <ø> (ø)
opensearch-observability	76.60% <ø> (ø)

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