Remove CREATED from bundle.json

[zappy-shu]

- What I did

Removes the created date from the bundle.json and the image ls output

This has been done to make builds more reproducable as the current solution means the App Image ID will change on each build

We will look at re-adding the created date once the underlying bundle store has been updated.

- How to verify it

Build a Docker App and:

• Run docker app image ls: there should no longer be a CREATED column.
• Open the image's bundle.json: there should be no custom:com.docker.app:payload:created property.

- Description for the changelog

Removes custom created date from Docker App bundle.json so as to make builds more repeatable.

- A picture of a cute animal (not mandatory)

[codecov[bot]]

Codecov Report

Merging #778 into master will decrease coverage by 1.48%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #778      +/-   ##
==========================================
- Coverage   71.82%   70.33%   -1.49%     
==========================================
  Files          67       67              
  Lines        3858     3712     -146     
==========================================
- Hits         2771     2611     -160     
- Misses        739      757      +18     
+ Partials      348      344       -4

Impacted Files	Coverage Δ
internal/commands/image/list.go	81.53% <ø> (-3.08%)	:arrow_down:
internal/packager/custom.go	72.09% <100%> (-1.25%)	:arrow_down:
internal/commands/image/formatter.go	85.96% <100%> (-1.14%)	:arrow_down:
internal/commands/build/build.go	60% <0%> (-19.46%)	:arrow_down:

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