feat(SimpleGraph): the cycle graph and complete graph are Hamiltonian

[vlad902]

---

• depends on: feat(SimpleGraph): cycleGraph_EulerianCircuit is a cycle #34797
• depends on: feat(SimpleGraph): cycleGraph.IsContained in every graph with a cycle #35255
  

[github-actions]

PR summary 24d904ee7b

Import changes exceeding 2%

%	File
+36.44%	Mathlib.Combinatorics.SimpleGraph.Hamiltonian

Import changes for modified files

Dependency changes

File	Base Count	Head Count	Change
Mathlib.Combinatorics.SimpleGraph.Hamiltonian	579	790	+211 (+36.44%)

Import changes for all files

Files	Import difference
Mathlib.Combinatorics.SimpleGraph.Hamiltonian	211

---

Declarations diff

+ cycleGraph_EulerianCircuit_isHamiltonianCycle
+ isContained_completeGraph_of_card_le_card
+ isHamiltonian_cycleGraph
+ isHamiltonian_iff_cycleGraph_isContained
+ isHamiltonian_top

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

---

No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[mathlib-dependent-issues]

This PR/issue depends on:

• feat(SimpleGraph): cycleGraph_EulerianCircuit is a cycle #34797
• feat(SimpleGraph): cycleGraph.IsContained in every graph with a cycle #35255
  By Dependent Issues (🤖). Happy coding!

[mathlib-merge-conflicts]

This pull request has conflicts, please merge master and resolve them.