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 #787 (164ba0d) into master (318dad2) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #787   +/-   ##
=========================================
  Coverage     89.01%   89.01%           
  Complexity      605      605           
=========================================
  Files            73       73           
  Lines          2258     2258           
  Branches        295      295           
=========================================
  Hits           2010     2010           
  Misses          157      157           
  Partials         91       91           

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