fix: list speakers only with confirmed/accepted sessions

[snitin315]

Short description of what this resolves:

Fixes #4813

Changes proposed in this pull request:

only list speakers with confirmed/accepted sessions on the public speakers page

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests, and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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[codecov]

Codecov Report

Merging #4828 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #4828   +/-   ##
============================================
  Coverage        23.48%   23.48%           
============================================
  Files              481      481           
  Lines             5085     5085           
  Branches            16       16           
============================================
  Hits              1194     1194           
  Misses            3887     3887           
  Partials             4        4           

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[iamareebjamal]

That's not the correct fix. People with deleted sessions are being included. That's the bug. I have fixed it. Sending PR soon

[iamareebjamal]

Superseded by #4830