Remove templates

[albertteoh]

Signed-off-by: albertteoh albert.teoh@logz.io

Which problem is this PR solving?

• Relates to Org-wide issue/PR templates jaeger#2974

Short description of the changes

• Removes template files which are now redundant with the introduction of org-wide templates.

[codecov]

Codecov Report

Merging #469 (1f9fa57) into master (634a6f0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #469   +/-   ##
=======================================
  Coverage   98.72%   98.72%           
=======================================
  Files          50       50           
  Lines        2044     2044           
  Branches      386      386           
=======================================
  Hits         2018     2018           
  Misses         26       26           

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