Remove incompatible script for generating DB changeset

[PVince81]

Description

Since the move to DB migrations, this script cannot work any more,
especially considering that there can be non-DB migrations in the mix.

Related Issue

• Fixes <issue_link>

Motivation and Context

How Has This Been Tested?

occ command doesn't show it any more

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised: Remove db:generate-change-script docs#717

Open tasks:

• Backport (if applicable set "backport-request" label and remove when the backport was done)

[sharidas]

LGTM

[codecov]

Codecov Report

Merging #34721 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #34721      +/-   ##
============================================
+ Coverage     65.28%    65.3%   +0.01%     
+ Complexity    18481    18478       -3     
============================================
  Files          1210     1209       -1     
  Lines         69984    69964      -20     
  Branches       1280     1280              
============================================
  Hits          45688    45688              
+ Misses        23924    23904      -20     
  Partials        372      372

Flag	Coverage Δ	Complexity Δ
#javascript	53.04% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.71% <ø> (+0.02%)	18478 <ø> (-3)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
core/register_command.php	0% <ø> (ø)	0 <0> (ø)	⬇️

---

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[codecov]

Codecov Report

Merging #34721 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #34721      +/-   ##
============================================
+ Coverage     65.28%    65.3%   +0.01%     
+ Complexity    18481    18478       -3     
============================================
  Files          1210     1209       -1     
  Lines         69984    69964      -20     
  Branches       1280     1280              
============================================
  Hits          45688    45688              
+ Misses        23924    23904      -20     
  Partials        372      372

Flag	Coverage Δ	Complexity Δ
#javascript	53.04% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.71% <ø> (+0.02%)	18478 <ø> (-3)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
core/register_command.php	0% <ø> (ø)	0 <0> (ø)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a93e321...c3bf29a. Read the comment docs.

[PVince81]

stable10: #34722

[phil-davis]

Doc removal owncloud/docs#717