[MI-54922] Replaced the "text/template" package with "html/template"

[raghavaggarwal2308]

Summary

Replaced the "text/template" package with "html/template"

[jupenur]

I don't think this will work since there's a mixture of HTML and non-HTML templates that we use. Only the ones that are actually HTML should use html/template.

[raghavaggarwal2308]

@jupenur I have tested it for "application/json" and "markdown" templates, and everything seems to work fine. Also, in the documentation of html/template, it's mentioned that this package wraps "text/template". Please let me know your opinions on this.

This package wraps [text/template](https://pkg.go.dev/text/template) so you can share its template API to parse and execute HTML templates safely.

[mickmister]

@raghavaggarwal2308 In general, we should only use the html/template library when we are specifically generating HTML for the response. It has different behavior than text/template in that it sanitizes the input in ways that we may otherwise want to preserve when the output is not intended to be HTML

[raghavaggarwal2308]

@mickmister @jupenur Updated logic to use 'html/template' for HTML templates only.

[mickmister]

LGTM

[codecov-commenter]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (d1e233a) 29.65% compared to head (dddb81d) 29.69%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #988      +/-   ##
==========================================
+ Coverage   29.65%   29.69%   +0.04%     
==========================================
  Files          52       52              
  Lines        7794     7812      +18     
==========================================
+ Hits         2311     2320       +9     
- Misses       5287     5295       +8     
- Partials      196      197       +1     

Files	Coverage Δ
server/command.go	15.32% <100.00%> (ø)
server/user_cloud_oauth.go	0.00% <0.00%> (ø)
server/user_cloud.go	0.00% <0.00%> (ø)
server/plugin.go	11.43% <0.00%> (-0.05%)	⬇️
server/user_server.go	7.33% <0.00%> (ø)
server/http.go	69.62% <31.57%> (-0.43%)	⬇️

... and 1 file with indirect coverage changes

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[AayushChaudhary0001]

Tested and Approved
Working fine for both cloud and server, LGTM