[stable10] add phpstan drop php 7.0

[phil-davis]

PRs
#35774 Introduce phpstan - note: has now been merged into stable10
#35786 drop PHP 7.0
together.

To see if it all works.

[codecov]

Codecov Report

Merging #35788 into stable10 will increase coverage by 0.33%.
The diff coverage is 75%.

@@              Coverage Diff               @@
##             stable10   #35788      +/-   ##
==============================================
+ Coverage       64.84%   65.17%   +0.33%     
+ Complexity      20243    20194      -49     
==============================================
  Files            1299     1298       -1     
  Lines           77220    77125      -95     
  Branches         1301     1301              
==============================================
+ Hits            50070    50266     +196     
+ Misses          26765    26474     -291     
  Partials          385      385

Flag	Coverage Δ	Complexity Δ
#javascript	53.85% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.37% <75%> (+0.37%)	20194 <41> (-49)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Session/Session.php	100% <ø> (ø)	5 <0> (ø)	⬇️
lib/private/DB/MigrationService.php	90.44% <ø> (ø)	53 <0> (ø)	⬇️
lib/private/DB/ConnectionFactory.php	90.27% <ø> (+7.38%)	21 <0> (ø)	⬇️
lib/private/Session/CryptoWrapper.php	47.05% <ø> (ø)	6 <0> (ø)	⬇️
core/Command/Maintenance/DataFingerprint.php	100% <ø> (ø)	4 <0> (ø)	⬇️
lib/private/Files/Node/Folder.php	96.15% <ø> (-0.03%)	45 <0> (ø)
lib/private/Files/Cache/Wrapper/CacheWrapper.php	89.06% <ø> (+2.69%)	29 <0> (-1)	⬇️
apps/systemtags/appinfo/app.php	14.28% <ø> (ø)	0 <0> (ø)	⬇️
core/Command/Group/AddMember.php	100% <ø> (ø)	9 <0> (ø)	⬇️
lib/private/legacy/util.php	70.18% <ø> (+2.84%)	239 <0> (-2)	⬇️
... and 104 more

---

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[codecov]

Codecov Report

Merging #35788 into stable10 will increase coverage by 0.07%.
The diff coverage is 70%.

@@              Coverage Diff               @@
##             stable10   #35788      +/-   ##
==============================================
+ Coverage       65.09%   65.17%   +0.07%     
+ Complexity      20239    20194      -45     
==============================================
  Files            1300     1298       -2     
  Lines           77238    77125     -113     
  Branches         1301     1301              
==============================================
- Hits            50279    50266      -13     
+ Misses          26574    26474     -100     
  Partials          385      385

Flag	Coverage Δ	Complexity Δ
#javascript	53.85% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.37% <70%> (+0.08%)	20194 <11> (-45)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/DB/ConnectionFactory.php	90.27% <ø> (+7.38%)	21 <0> (ø)	⬇️
index.php	0% <0%> (ø)	0 <0> (ø)	⬇️
console.php	0% <0%> (ø)	0 <0> (ø)	⬇️
lib/private/DB/MySqlTools.php	88.46% <82.35%> (+88.46%)	11 <11> (+7)	⬆️
lib/private/DB/OCPostgreSqlPlatform.php	24.13% <0%> (-72.42%)	15% <0%> (ø)
lib/private/DB/Connection.php	67.64% <0%> (-2.21%)	49% <0%> (ø)
lib/private/Comments/Manager.php	95.76% <0%> (-0.02%)	73% <0%> (-1%)
lib/private/DB/MDB2SchemaWriter.php	94.79% <0%> (+1.04%)	34% <0%> (ø)	⬇️
lib/private/Repair/Collation.php	87.5% <0%> (+5%)	12% <0%> (ø)	⬇️
... and 2 more

---

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Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2d2dbc1...669c7a3. Read the comment docs.

[phil-davis]

CI green - great stuff.
This is a working example of phpstan and dropping PHP 7.0 on stable10

[phil-davis]

After rebase just now, this PR ends up the same as #35786
I will close here after the CI result comes.