feat: modify cancel notif message and add required links

[uds5501]

Fixes #6085

Changes proposed in this pull request:

• modify both ticket cancellation notifications
• add links as required.

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests 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)

• All the functions created/modified in this PR contain relevant docstrings.

Notifications after the change :

[codecov]

Codecov Report

Merging #6084 into development will increase coverage by 0.03%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##           development   #6084      +/-   ##
==============================================
+ Coverage        66.17%   66.2%   +0.03%     
==============================================
  Files              285     285              
  Lines            14133   14134       +1     
==============================================
+ Hits              9353    9358       +5     
+ Misses            4780    4776       -4

Impacted Files	Coverage Δ
app/api/helpers/system_notifications.py	100% <ø> (ø)	⬆️
app/api/helpers/notification.py	21.97% <100%> (+0.86%)	⬆️
app/api/helpers/scheduled_jobs.py	26.59% <0%> (+4.25%)	⬆️

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[uds5501]

@mrsaicharan1 @shreyanshdwivedi Please review!

[uds5501]

@CosmicCoder96 @iamareebjamal Please take a look?

[mrsaicharan1]

I believe that cancelled/expired tickets don't have any vacancy. How is it that you're planning for that

[uds5501]

@mrsaicharan1 I don't think we need to do anything for that. The issue required a ticket link and I provided that. A cancelled order having no ticket holders is as it is supposed to be.

Any cancelled ticket should be relocated so that it's available for sale.

[mrsaicharan1]

@mrsaicharan1 I don't think we need to do anything for that. The issue required a ticket link and I provided that. A cancelled order having no ticket holders is as it is supposed to be.

Any cancelled ticket should be relocated so that it's available for sale.

Agreed

[mrsaicharan1]

LGTM